/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.core.tests.compiler.regression;
import junit.framework.*;
import org.eclipse.jdt.internal.compiler.impl.CompilerOptions;
public class MethodVerifyTest extends AbstractComparableTest {
public MethodVerifyTest(String name) {
super(name);
}
public static Test suite() {
Test suite = buildTestSuite(testClass());
TESTS_COUNTERS.put(testClass().getName(), new Integer(suite.countTestCases()));
return suite;
}
public static Class testClass() {
return MethodVerifyTest.class;
}
public void test001() {
this.runNegativeTest(
new String[] {
"Y.java",
"public class Y<T> extends X<A> { public void foo(T t) {} }\n" +
"class X<U> { public void foo(U u) {} }\n" +
"class A {}\n"
},
"----------\n" +
"1. ERROR in Y.java (at line 1)\r\n" +
" public class Y<T> extends X<A> { public void foo(T t) {} }\r\n" +
" ^^^^^^^^\n" +
"Name clash: The method foo(T) of type Y<T> has the same erasure as foo(U) of type X<U> but does not override it\n" +
"----------\n"
// name clash: foo(T) in Y<T> and foo(U) in X<A> have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"J.java",
"public class J<T> implements I<A> { public void foo(T t) {} }\n" +
"interface I<U> { public void foo(U u); }\n" +
"class A {}\n"
},
"----------\n" +
"1. ERROR in J.java (at line 1)\r\n" +
" public class J<T> implements I<A> { public void foo(T t) {} }\r\n" +
" ^\n" +
"The type J<T> must implement the inherited abstract method I<A>.foo(A)\n" +
"----------\n" +
"2. ERROR in J.java (at line 1)\r\n" +
" public class J<T> implements I<A> { public void foo(T t) {} }\r\n" +
" ^^^^^^^^\n" +
"Name clash: The method foo(T) of type J<T> has the same erasure as foo(U) of type I<U> but does not override it\n" +
"----------\n"
// J is not abstract and does not override abstract method foo(A) in I
);
this.runNegativeTest(
new String[] {
"YY.java",
"public class YY<T> extends X { public void foo(T t) {} }\n" +
"class X<U> { public void foo(U u) {} }\n"
},
"----------\n" +
"1. ERROR in YY.java (at line 1)\r\n" +
" public class YY<T> extends X { public void foo(T t) {} }\r\n" +
" ^^^^^^^^\n" +
"Name clash: The method foo(T) of type YY<T> has the same erasure as foo(U) of type X<U> but does not override it\n" +
"----------\n"
// name clash: foo(T) in YY<T> and foo(U) in X have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"JJ.java",
"public class JJ<T> implements I { public void foo(T t) {} }\n" +
"interface I<U> { public void foo(U u); }\n"
},
"----------\n" +
"1. ERROR in JJ.java (at line 1)\r\n" +
" public class JJ<T> implements I { public void foo(T t) {} }\r\n" +
" ^^\n" +
"The type JJ<T> must implement the inherited abstract method I.foo(Object)\n" +
"----------\n" +
"2. ERROR in JJ.java (at line 1)\r\n" +
" public class JJ<T> implements I { public void foo(T t) {} }\r\n" +
" ^^^^^^^^\n" +
"Name clash: The method foo(T) of type JJ<T> has the same erasure as foo(U) of type I<U> but does not override it\n" +
"----------\n"
// JJ is not abstract and does not override abstract method foo(java.lang.Object) in I
);
this.runConformTest(
new String[] {
"YYY.java",
"public class YYY<T> extends X<T> { public void foo(T t) {} }\n" +
"class X<U> { public void foo(U u) {} }\n"
},
""
);
this.runConformTest(
new String[] {
"JJJ.java",
"public class JJJ<T> implements I<T> { public void foo(T t) {} }\n" +
"interface I<U> { public void foo(U u); }\n"
},
""
);
}
public void test002() { // separate files
this.runNegativeTest(
new String[] {
"Y.java",
"public class Y<T> extends X<A> { public void foo(T t) {} }\n" +
"class A {}\n",
"X.java",
"class X<U> { public void foo(U u) {} }\n"
},
"----------\n" +
"1. ERROR in Y.java (at line 1)\r\n" +
" public class Y<T> extends X<A> { public void foo(T t) {} }\r\n" +
" ^^^^^^^^\n" +
"Name clash: The method foo(T) of type Y<T> has the same erasure as foo(U) of type X<U> but does not override it\n" +
"----------\n"
// name clash: foo(T) in Y<T> and foo(U) in X<A> have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"J.java",
"public class J<T> implements I<A> { public void foo(T t) {} }\n" +
"class A {}\n",
"I.java",
"interface I<U> { public void foo(U u); }\n"
},
"----------\n" +
"1. ERROR in J.java (at line 1)\r\n" +
" public class J<T> implements I<A> { public void foo(T t) {} }\r\n" +
" ^\n" +
"The type J<T> must implement the inherited abstract method I<A>.foo(A)\n" +
"----------\n" +
"2. ERROR in J.java (at line 1)\r\n" +
" public class J<T> implements I<A> { public void foo(T t) {} }\r\n" +
" ^^^^^^^^\n" +
"Name clash: The method foo(T) of type J<T> has the same erasure as foo(U) of type I<U> but does not override it\n" +
"----------\n"
// J is not abstract and does not override abstract method foo(A) in I
);
this.runNegativeTest(
new String[] {
"YY.java",
"public class YY<T> extends X { public void foo(T t) {} }\n",
"X.java",
"class X<U> { public void foo(U u) {} }\n"
},
"----------\n" +
"1. ERROR in YY.java (at line 1)\r\n" +
" public class YY<T> extends X { public void foo(T t) {} }\r\n" +
" ^^^^^^^^\n" +
"Name clash: The method foo(T) of type YY<T> has the same erasure as foo(U) of type X<U> but does not override it\n" +
"----------\n"
// name clash: foo(T) in YY<T> and foo(U) in X have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"JJ.java",
"public class JJ<T> implements I { public void foo(T t) {} }\n",
"I.java",
"interface I<U> { public void foo(U u); }\n"
},
"----------\n" +
"1. ERROR in JJ.java (at line 1)\r\n" +
" public class JJ<T> implements I { public void foo(T t) {} }\r\n" +
" ^^\n" +
"The type JJ<T> must implement the inherited abstract method I.foo(Object)\n" +
"----------\n" +
"2. ERROR in JJ.java (at line 1)\r\n" +
" public class JJ<T> implements I { public void foo(T t) {} }\r\n" +
" ^^^^^^^^\n" +
"Name clash: The method foo(T) of type JJ<T> has the same erasure as foo(U) of type I<U> but does not override it\n" +
"----------\n"
// JJ is not abstract and does not override abstract method foo(java.lang.Object) in I
);
this.runConformTest(
new String[] {
"YYY.java",
"public class YYY<T> extends X<T> { public void foo(T t) {} }\n",
"X.java",
"class X<U> { public void foo(U u) {} }\n"
},
""
);
this.runConformTest(
new String[] {
"JJJ.java",
"public class JJJ<T> implements I<T> { public void foo(T t) {} }\n",
"I.java",
"interface I<U> { public void foo(U u); }\n"
},
""
);
}
public void test003() { // pick up superTypes as binaries
this.runConformTest(
new String[] {
"A.java",
"class A {}\n",
"B.java",
"class B {}\n",
"X.java",
"class X<U> { public void foo(U u) {} }\n",
"I.java",
"interface I<U> { public void foo(U u); }\n",
},
""
);
this.runNegativeTest(
new String[] {
"Y.java",
"public class Y<T> extends X<A> { public void foo(T t) {} }\n"
},
"----------\n" +
"1. ERROR in Y.java (at line 1)\r\n" +
" public class Y<T> extends X<A> { public void foo(T t) {} }\r\n" +
" ^^^^^^^^\n" +
"Name clash: The method foo(T) of type Y<T> has the same erasure as foo(U) of type X<U> but does not override it\n" +
"----------\n",
// name clash: foo(T) in Y<T> and foo(U) in X<A> have the same erasure, yet neither overrides the other
null,
false,
null
);
this.runNegativeTest(
new String[] {
"J.java",
"public class J<T> implements I<A> { public void foo(T t) {} }\n"
},
"----------\n" +
"1. ERROR in J.java (at line 1)\r\n" +
" public class J<T> implements I<A> { public void foo(T t) {} }\r\n" +
" ^\n" +
"The type J<T> must implement the inherited abstract method I<A>.foo(A)\n" +
"----------\n" +
"2. ERROR in J.java (at line 1)\r\n" +
" public class J<T> implements I<A> { public void foo(T t) {} }\r\n" +
" ^^^^^^^^\n" +
"Name clash: The method foo(T) of type J<T> has the same erasure as foo(U) of type I<U> but does not override it\n" +
"----------\n",
// J is not abstract and does not override abstract method foo(A) in I
null,
false,
null
);
this.runNegativeTest(
new String[] {
"YY.java",
"public class YY<T> extends X { public void foo(T t) {} }\n"
},
"----------\n" +
"1. ERROR in YY.java (at line 1)\r\n" +
" public class YY<T> extends X { public void foo(T t) {} }\r\n" +
" ^^^^^^^^\n" +
"Name clash: The method foo(T) of type YY<T> has the same erasure as foo(U) of type X<U> but does not override it\n" +
"----------\n",
// name clash: foo(T) in YY<T> and foo(U) in X have the same erasure, yet neither overrides the other
null,
false,
null
);
this.runNegativeTest(
new String[] {
"JJ.java",
"public class JJ<T> implements I { public void foo(T t) {} }\n"
},
"----------\n" +
"1. ERROR in JJ.java (at line 1)\r\n" +
" public class JJ<T> implements I { public void foo(T t) {} }\r\n" +
" ^^\n" +
"The type JJ<T> must implement the inherited abstract method I.foo(Object)\n" +
"----------\n" +
"2. ERROR in JJ.java (at line 1)\r\n" +
" public class JJ<T> implements I { public void foo(T t) {} }\r\n" +
" ^^^^^^^^\n" +
"Name clash: The method foo(T) of type JJ<T> has the same erasure as foo(U) of type I<U> but does not override it\n" +
"----------\n",
// JJ is not abstract and does not override abstract method foo(java.lang.Object) in I
null,
false,
null
);
this.runConformTest(
new String[] {
"YYY.java",
"public class YYY<T> extends X<T> { public void foo(T t) {} }\n"
},
"",
null,
false,
null
);
this.runConformTest(
new String[] {
"JJJ.java",
"public class JJJ<T> implements I<T> { public void foo(T t) {} }\n"
},
"",
null,
false,
null
);
}
public void test004() { // all together
this.runNegativeTest(
new String[] {
"ALL.java",
"class A {}\n" +
"class B {}\n" +
"class X<U> { public U foo() {return null;} }\n" +
"interface I<U> { public U foo(); }\n" +
"class J<T> implements I<B> { public T foo() {return null;} }\n" +
"class K<T> implements I<T> { public T foo() {return null;} }\n" +
"class L<T> implements I { public T foo() {return null;} }\n" +
"class Y<T> extends X<A> { public T foo() { return super.foo(); } }\n" +
"class Z<T> extends X<T> { @Override public T foo() { return super.foo(); } }\n" +
"class W<T> extends X { @Override public T foo() { return super.foo(); } }\n",
},
"----------\n" +
"1. ERROR in ALL.java (at line 5)\n" +
" class J<T> implements I<B> { public T foo() {return null;} }\n" +
" ^^^^^\n" +
"The return type is incompatible with I<B>.foo()\n" +
"----------\n" +
"2. ERROR in ALL.java (at line 8)\n" +
" class Y<T> extends X<A> { public T foo() { return super.foo(); } }\n" +
" ^^^^^\n" +
"The return type is incompatible with X<A>.foo()\n" +
"----------\n" +
"3. ERROR in ALL.java (at line 8)\n" +
" class Y<T> extends X<A> { public T foo() { return super.foo(); } }\n" +
" ^^^^^^^^^^^\n" +
"Type mismatch: cannot convert from A to T\n" +
"----------\n" +
"4. WARNING in ALL.java (at line 10)\n" +
" class W<T> extends X { @Override public T foo() { return super.foo(); } }\n" +
" ^^^^^^^^^^^\n" +
"Type safety: The method foo() belongs to the raw type X. References to generic type X<U> should be parameterized\n" +
"----------\n" +
"5. ERROR in ALL.java (at line 10)\n" +
" class W<T> extends X { @Override public T foo() { return super.foo(); } }\n" +
" ^^^^^^^^^^^\n" +
"Type mismatch: cannot convert from Object to T\n" +
"----------\n"
/*
ALL.java:5: J is not abstract and does not override abstract method foo() in I
ALL.java:5: foo() in J cannot implement foo() in I; attempting to use incompatible return type
ALL.java:8: foo() in Y cannot override foo() in X; attempting to use incompatible return type
ALL.java:8: incompatible types
found : A
required: T
class Y<T> extends X<A> { public T foo() { return super.foo(); } }
^
ALL.java:10: incompatible types
found : java.lang.Object
required: T
class W<T> extends X { public T foo() { return super.foo(); } }
*/
);
}
public void test005() { // separate files
this.runNegativeTest(
new String[] {
"A.java",
"class A {}\n",
"B.java",
"class B {}\n",
"X.java",
"class X<U> { public U foo() {return null;} }\n",
"I.java",
"interface I<U> { public U foo(); }\n",
"J.java",
"class J<T> implements I<B> { public T foo() {return null;} }\n",
"K.java",
"class K<T> implements I<T> { public T foo() {return null;} }\n",
"L.java",
"class L<T> implements I { public T foo() {return null;} }\n",
"Y.java",
"class Y<T> extends X<A> { public T foo() { return super.foo(); } }\n",
"Z.java",
"class Z<T> extends X<T> { @Override public T foo() { return super.foo(); } }\n",
"W.java",
"class W<T> extends X { @Override public T foo() { return super.foo(); } }\n",
},
"----------\n" +
"1. ERROR in J.java (at line 1)\n" +
" class J<T> implements I<B> { public T foo() {return null;} }\n" +
" ^^^^^\n" +
"The return type is incompatible with I<B>.foo()\n" +
"----------\n" +
"----------\n" +
"1. ERROR in Y.java (at line 1)\n" +
" class Y<T> extends X<A> { public T foo() { return super.foo(); } }\n" +
" ^^^^^\n" +
"The return type is incompatible with X<A>.foo()\n" +
"----------\n" +
"2. ERROR in Y.java (at line 1)\n" +
" class Y<T> extends X<A> { public T foo() { return super.foo(); } }\n" +
" ^^^^^^^^^^^\n" +
"Type mismatch: cannot convert from A to T\n" +
"----------\n" +
"----------\n" +
"1. WARNING in W.java (at line 1)\n" +
" class W<T> extends X { @Override public T foo() { return super.foo(); } }\n" +
" ^^^^^^^^^^^\n" +
"Type safety: The method foo() belongs to the raw type X. References to generic type X<U> should be parameterized\n" +
"----------\n" +
"2. ERROR in W.java (at line 1)\n" +
" class W<T> extends X { @Override public T foo() { return super.foo(); } }\n" +
" ^^^^^^^^^^^\n" +
"Type mismatch: cannot convert from Object to T\n" +
"----------\n"
/*
J.java:1: J is not abstract and does not override abstract method foo() in I
J.java:1: foo() in J cannot implement foo() in I; attempting to use incompatible return type
W.java:1: incompatible types
found : java.lang.Object
required: T
class W<T> extends X { public T foo() { return super.foo(); } }
Y.java:1: foo() in Y cannot override foo() in X; attempting to use incompatible return type
Y.java:1: incompatible types
found : A
required: T
class Y<T> extends X<A> { public T foo() { return super.foo(); } }
*/
);
}
public void test006() { // pick up superTypes as binaries
this.runConformTest(
new String[] {
"A.java",
"class A {}\n",
"B.java",
"class B {}\n",
"X.java",
"class X<U> { public U foo() {return null;} }\n",
"I.java",
"interface I<U> { public U foo(); }\n",
},
""
);
this.runNegativeTest(
new String[] {
"J.java",
"class J<T> implements I<B> { public T foo() {return null;} }\n",
"K.java",
"class K<T> implements I<T> { public T foo() {return null;} }\n",
"L.java",
"class L<T> implements I { public T foo() {return null;} }\n",
"Y.java",
"class Y<T> extends X<A> { public T foo() { return super.foo(); } }\n",
"Z.java",
"class Z<T> extends X<T> { @Override public T foo() { return super.foo(); } }\n",
"W.java",
"class W<T> extends X { @Override public T foo() { return super.foo(); } }\n",
},
"----------\n" +
"1. ERROR in J.java (at line 1)\n" +
" class J<T> implements I<B> { public T foo() {return null;} }\n" +
" ^^^^^\n" +
"The return type is incompatible with I<B>.foo()\n" +
"----------\n" +
"----------\n" +
"1. ERROR in Y.java (at line 1)\n" +
" class Y<T> extends X<A> { public T foo() { return super.foo(); } }\n" +
" ^^^^^\n" +
"The return type is incompatible with X<A>.foo()\n" +
"----------\n" +
"2. ERROR in Y.java (at line 1)\n" +
" class Y<T> extends X<A> { public T foo() { return super.foo(); } }\n" +
" ^^^^^^^^^^^\n" +
"Type mismatch: cannot convert from A to T\n" +
"----------\n" +
"----------\n" +
"1. WARNING in W.java (at line 1)\n" +
" class W<T> extends X { @Override public T foo() { return super.foo(); } }\n" +
" ^^^^^^^^^^^\n" +
"Type safety: The method foo() belongs to the raw type X. References to generic type X<U> should be parameterized\n" +
"----------\n" +
"2. ERROR in W.java (at line 1)\n" +
" class W<T> extends X { @Override public T foo() { return super.foo(); } }\n" +
" ^^^^^^^^^^^\n" +
"Type mismatch: cannot convert from Object to T\n" +
"----------\n",
/*
J.java:1: J is not abstract and does not override abstract method foo() in I
J.java:1: foo() in J cannot implement foo() in I; attempting to use incompatible return type
W.java:1: incompatible types
found : java.lang.Object
required: T
class W<T> extends X { public T foo() { return super.foo(); } }
Y.java:1: foo() in Y cannot override foo() in X; attempting to use incompatible return type
Y.java:1: incompatible types
found : A
required: T
class Y<T> extends X<A> { public T foo() { return super.foo(); } }
*/
null,
false,
null
);
}
public void test007() { // simple covariance cases
this.runConformTest(
new String[] {
"A.java",
"abstract class A implements I {}\n" +
"interface I extends J { String foo(); }\n" +
"interface J { Object foo(); }\n",
"X.java",
"abstract class X1 extends A implements J {}\n"
},
""
);
this.runNegativeTest(
new String[] {
"A.java",
"abstract class A implements I {}\n" +
"interface I extends J { Object foo(); }\n" +
"interface J { String foo(); }\n",
"X.java",
"abstract class X2 extends A implements J {}\n"
},
"----------\n" +
"1. ERROR in A.java (at line 1)\r\n" +
" abstract class A implements I {}\r\n" +
" ^\n" +
"The return type is incompatible with J.foo(), I.foo()\n" +
"----------\n" +
"2. ERROR in A.java (at line 2)\r\n" +
" interface I extends J { Object foo(); }\r\n" +
" ^^^^^\n" +
"The return type is incompatible with J.foo()\n" +
"----------\n" +
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" abstract class X2 extends A implements J {}\r\n" +
" ^^\n" +
"The return type is incompatible with I.foo(), J.foo()\n" +
"----------\n"
);
this.runConformTest(
new String[] {
"A.java",
"abstract class A implements I {}\n" +
"interface I { String foo(); }\n",
"X.java",
"abstract class X3 extends A implements J {}\n" +
"interface J { Object foo(); }\n"
},
""
);
this.runConformTest(
new String[] {
"A.java",
"abstract class A implements I {}\n" +
"interface I { Object foo(); }\n",
"X.java",
"abstract class X4 extends A implements J {}\n" +
"interface J { String foo(); }\n"
},
""
);
this.runConformTest(
new String[] {
"A.java",
"class A { public String foo() { return null; } }\n" +
"interface I { Object foo(); }\n",
"X.java",
"abstract class X5 extends A implements I {}\n"
},
""
);
this.runNegativeTest(
new String[] {
"A.java",
"class A { public Object foo() { return null; } }\n" +
"interface I { String foo(); }\n",
"X.java",
"abstract class X6 extends A implements I {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" abstract class X6 extends A implements I {}\r\n" +
" ^^\n" +
"The return type is incompatible with I.foo(), A.foo()\n" +
"----------\n"
);
this.runNegativeTest(
new String[] {
"A.java",
"class A { int get(short i, short s) { return i; } }\n" +
"class B extends A { short get(short i, short s) {return i; } }\n"
},
"----------\n" +
"1. ERROR in A.java (at line 2)\r\n" +
" class B extends A { short get(short i, short s) {return i; } }\r\n" +
" ^^^^^^^^^^^^^^^^^^^^^\n" +
"The return type is incompatible with A.get(short, short)\n" +
"----------\n"
);
}
public void test008() { // covariance test
this.runNegativeTest(
new String[] {
"ALL.java",
"interface I { I foo(); }\n" +
"class A implements I { public A foo() { return null; } }\n" +
"class B extends A { @Override public B foo() { return null; } }\n" +
"class C extends B { public A foo() { return null; } }\n" +
"class D extends B implements I {}\n",
},
"----------\n" +
"1. ERROR in ALL.java (at line 4)\r\n" +
" class C extends B { public A foo() { return null; } }\r\n" +
" ^^^^^\n" +
"The return type is incompatible with B.foo()\n" +
"----------\n"
// foo() in C cannot override foo() in B; attempting to use incompatible return type
);
}
public void test009() {
this.runNegativeTest(
new String[] {
"A.java",
"class G<T> {}\n" +
"interface I { void foo(G<I> x); }\n" +
"abstract class A implements I { void foo(G<A> x) {} }\n"
},
"----------\n" +
"1. ERROR in A.java (at line 3)\r\n" +
" abstract class A implements I { void foo(G<A> x) {} }\r\n" +
" ^^^^^^^^^^^\n" +
"Name clash: The method foo(G<A>) of type A has the same erasure as foo(G<I>) of type I but does not override it\n" +
"----------\n"
// name clash: foo(G<A>) in A and foo(G<I>) in I have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"A.java",
"class G<T> {}\n" +
"interface I { I foo(G<I> x); }\n" +
"abstract class A implements I { I foo(G<A> x) { return null; } }\n"
},
"----------\n" +
"1. ERROR in A.java (at line 3)\r\n" +
" abstract class A implements I { I foo(G<A> x) { return null; } }\r\n" +
" ^^^^^^^^^^^\n" +
"Name clash: The method foo(G<A>) of type A has the same erasure as foo(G<I>) of type I but does not override it\n" +
"----------\n"
// name clash: foo(G<A>) in A and foo(G<I>) in I have the same erasure, yet neither overrides the other
);
}
public void test010() { // executable bridge method case
this.runConformTest(
new String[] {
"X.java",
"public class X {\n" +
" public X foo() {\n" +
" System.out.println(\"Did NOT add bridge method\");\n" +
" return this;\n" +
" }\n" +
" public static void main(String[] args) throws Exception {\n" +
" X x = new A();\n" +
" x.foo();\n" +
" System.out.print(\" + \");\n" +
" I i = new A();\n" +
" i.foo();\n" +
" }\n" +
"}\n" +
"interface I {\n" +
" public I foo();\n" +
"}\n" +
"class A extends X implements I {\n" +
" public A foo() {\n" +
" System.out.print(\"Added bridge method\");\n" +
" return this;\n" +
" }\n" +
"}\n"
},
"Added bridge method + Added bridge method"
);
}
public void test011() {
// javac 1.5.0 will only issue 1 name clash per compile... doesn't matter how many source files are involved
this.runNegativeTest(
new String[] {
"A.java",
"class A { <T> void foo(T t) {} }\n" +
"interface I { <T> void foo(T t); }\n",
"X.java",
"abstract class X1 extends A implements I {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" abstract class X1 extends A implements I {}\r\n" +
" ^^\n" +
"The inherited method A.foo(T) cannot hide the public abstract method in I\n" +
"----------\n"
// <T>foo(T) in A cannot implement <T>foo(T) in I; attempting to assign weaker access privileges; was public
);
this.runNegativeTest(
new String[] {
"A.java",
"class A { <T, S> void foo(T t) {} }\n" +
"interface I { <T> void foo(T t); }\n",
"X.java",
"abstract class X2 extends A implements I {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\n" +
" abstract class X2 extends A implements I {}\n" +
" ^^\n" +
"Name clash: The method foo(T) of type A has the same erasure as foo(T) of type I but does not override it\n" +
"----------\n"
// name clash: <T,S>foo(T) in A and <T>foo(T) in I have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"A.java",
"class A { <T> void foo(T t) {} }\n" +
"interface I { <T, S> void foo(T t); }\n",
"X.java",
"abstract class X3 extends A implements I {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\n" +
" abstract class X3 extends A implements I {}\n" +
" ^^\n" +
"Name clash: The method foo(T) of type A has the same erasure as foo(T) of type I but does not override it\n" +
"----------\n"
// name clash: <T>foo(T) in A and <T,S>foo(T) in I have the same erasure, yet neither overrides the other
);
}
public void test012() {
this.runNegativeTest(
new String[] {
"A.java",
"class A { public <T> void foo(T s) {} }\n" +
"class Y1 extends A { @Override void foo(Object s) {} }\n"
},
"----------\n" +
"1. ERROR in A.java (at line 2)\n" +
" class Y1 extends A { @Override void foo(Object s) {} }\n" +
" ^^^^^^^^^^^^^\n" +
"Cannot reduce the visibility of the inherited method from A\n" +
"----------\n"
// foo(java.lang.Object) in Y1 cannot override <T>foo(T) in A; attempting to assign weaker access privileges; was public
);
this.runNegativeTest(
new String[] {
"A.java",
"class A { public <T> void foo(T[] s) {} }\n" +
"class Y2 extends A { @Override void foo(Object[] s) {} }\n"
},
"----------\n" +
"1. ERROR in A.java (at line 2)\n" +
" class Y2 extends A { @Override void foo(Object[] s) {} }\n" +
" ^^^^^^^^^^^^^^^\n" +
"Cannot reduce the visibility of the inherited method from A\n" +
"----------\n"
// foo(java.lang.Object[]) in Y2 cannot override <T>foo(T[]) in A; attempting to assign weaker access privileges; was public
);
this.runNegativeTest(
new String[] {
"A.java",
"class A { public void foo(Class<Object> s) {} }\n" +
"class Y3 extends A { @Override void foo(Class<Object> s) {} }\n"
},
"----------\n" +
"1. ERROR in A.java (at line 2)\r\n" +
" class Y3 extends A { @Override void foo(Class<Object> s) {} }\r\n" +
" ^^^^^^^^^^^^^^^^^^^^\n" +
"Cannot reduce the visibility of the inherited method from A\n" +
"----------\n"
// foo(java.lang.Class<java.lang.Object>) in Y3 cannot override foo(java.lang.Class<java.lang.Object>) in A; attempting to assign weaker access privileges; was public
);
}
public void test013() {
// javac 1.5.0 will only issue 1 name clash per compile... doesn't matter how many source files are involved
this.runConformTest(
new String[] {
"A.java",
"class A { public <T> void foo(Class<T> s) {} }\n" +
"interface I { <T> void foo(Class<T> s); }\n",
"X.java",
"abstract class X0 extends A implements I {}\n"
},
""
);
this.runNegativeTest(
new String[] {
"A.java",
"class A { <T, S> void foo(Class<T> s) {} }\n" +
"interface I { <T> void foo(Class<T> s); }\n",
"X.java",
"abstract class X1 extends A implements I {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" abstract class X1 extends A implements I {}\r\n" +
" ^^\n" +
"Name clash: The method foo(Class<T>) of type A has the same erasure as foo(Class<T>) of type I but does not override it\n" +
"----------\n"
// name clash: <T,S>foo(java.lang.Class<T>) in A and <T>foo(java.lang.Class<T>) in I have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"A.java",
"class A { <T> void foo(Class<T> s) {} }\n" +
"interface I { <T, S> void foo(Class<T> s); }\n",
"X.java",
"abstract class X2 extends A implements I {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" abstract class X2 extends A implements I {}\r\n" +
" ^^\n" +
"Name clash: The method foo(Class<T>) of type A has the same erasure as foo(Class<T>) of type I but does not override it\n" +
"----------\n"
// name clash: <T>foo(java.lang.Class<T>) in A and <T,S>foo(java.lang.Class<T>) in I have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"A.java",
"class A { <T, S> S foo(Class<T> s) { return null; } }\n" +
"interface I { <T> Object foo(Class<T> s); }\n",
"X.java",
"abstract class X3 extends A implements I {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" abstract class X3 extends A implements I {}\r\n" +
" ^^\n" +
"Name clash: The method foo(Class<T>) of type A has the same erasure as foo(Class<T>) of type I but does not override it\n" +
"----------\n"
// name clash: <T,S>foo(java.lang.Class<T>) in A and <T>foo(java.lang.Class<T>) in I have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"A.java",
"class A { <T> Object foo(Class<T> s) { return null; } }\n" +
"interface I { <T, S> S foo(Class<T> s); }\n",
"X.java",
"abstract class X4 extends A implements I {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" abstract class X4 extends A implements I {}\r\n" +
" ^^\n" +
"Name clash: The method foo(Class<T>) of type A has the same erasure as foo(Class<T>) of type I but does not override it\n" +
"----------\n"
// name clash: <T>foo(java.lang.Class<T>) in A and <T,S>foo(java.lang.Class<T>) in I have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"A.java",
"class A { public <T, S> void foo(Class<T> s) {} }\n" +
"interface I { <T> void foo(Class<T> s); }\n",
"X.java",
"class X5 extends A implements I { public <T> void foo(Class<T> s) {} }\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" class X5 extends A implements I { public <T> void foo(Class<T> s) {} }\r\n" +
" ^^^^^^^^^^^^^^^\n" +
"Name clash: The method foo(Class<T>) of type X5 has the same erasure as foo(Class<T>) of type A but does not override it\n" +
"----------\n"
// name clash: <T>foo(java.lang.Class<T>) in X5 and <T,S>foo(java.lang.Class<T>) in A have the same erasure, yet neither overrides the other
);
}
public void test014() { // name clash tests
this.runConformTest(
new String[] {
"X.java",
"class X { void foo(A a) {} }\n" +
"class Y extends X { void foo(A a) {} }\n" +
"class A<T> {}\n"
},
""
);
this.runConformTest(
new String[] {
"X.java",
"class X { void foo(A[] a) {} }\n" +
"class Y extends X { void foo(A[] a) {} }\n" +
"class A<T> {}\n"
},
""
);
this.runConformTest(
new String[] {
"X.java",
"class X { void foo(A<String>[] a) {} }\n" +
"class Y extends X { void foo(A[] a) {} }\n" +
"class A<T> {}\n"
},
""
);
this.runConformTest(
new String[] {
"X.java",
"class X { void foo(A<String> a) {} }\n" +
"class Y extends X { void foo(A a) {} }\n" +
"class A<T> {}\n"
},
""
);
this.runNegativeTest(
new String[] {
"X.java",
"class X { void foo(A a) {} }\n" +
"class Y extends X { void foo(A<String> a) {} }\n" +
"class A<T> {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 2)\n" +
" class Y extends X { void foo(A<String> a) {} }\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Name clash: The method foo(A<String>) of type Y has the same erasure as foo(A) of type X but does not override it\n" +
"----------\n"
// name clash: foo(A<java.lang.String>) in Y and foo(A) in X have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"X.java",
"class X { void foo(A[] a) {} }\n" +
"class Y extends X { void foo(A<String>[] a) {} }\n" +
"class A<T> {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 2)\n" +
" class Y extends X { void foo(A<String>[] a) {} }\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Name clash: The method foo(A<String>[]) of type Y has the same erasure as foo(A[]) of type X but does not override it\n" +
"----------\n"
// name clash: foo(A<java.lang.String>[]) in Y and foo(A[]) in X have the same erasure, yet neither overrides the other
);
}
public void test015() { // more name clash tests
this.runConformTest(
new String[] {
"X.java",
"abstract class X extends Y implements I { }\n" +
"interface I { void foo(A a); }\n" +
"class Y { public void foo(A a) {} }\n" +
"class A<T> {}\n"
},
""
);
this.runConformTest(
new String[] {
"X.java",
"abstract class X extends Y implements I { }\n" +
"interface I { void foo(A[] a); }\n" +
"class Y { public void foo(A[] a) {} }\n" +
"class A<T> {}\n"
},
""
);
this.runConformTest(
new String[] {
"X.java",
"abstract class X extends Y implements I { }\n" +
"interface I { void foo(A<String>[] a); }\n" +
"class Y { public void foo(A[] a) {} }\n" +
"class A<T> {}\n"
},
""
);
this.runConformTest(
new String[] {
"X.java",
"abstract class X extends Y implements I { }\n" +
"interface I { void foo(A<String> a); }\n" +
"class Y { public void foo(A a) {} }\n" +
"class A<T> {}\n"
},
""
);
this.runNegativeTest(
new String[] {
"X.java",
"abstract class X extends Y implements I { }\n" +
"interface I { void foo(A a); }\n" +
"class Y { public void foo(A<String> a) {} }\n" +
"class A<T> {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" abstract class X extends Y implements I { }\r\n" +
" ^\n" +
"Name clash: The method foo(A<String>) of type Y has the same erasure as foo(A) of type I but does not override it\n" +
"----------\n"
// name clash: foo(A<java.lang.String>) in Y and foo(A) in I have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"X.java",
"abstract class X extends Y implements I { }\n" +
"interface I { void foo(A[] a); }\n" +
"class Y { public void foo(A<String>[] a) {} }\n" +
"class A<T> {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" abstract class X extends Y implements I { }\r\n" +
" ^\n" +
"Name clash: The method foo(A<String>[]) of type Y has the same erasure as foo(A[]) of type I but does not override it\n" +
"----------\n"
// name clash: foo(A<java.lang.String>[]) in Y and foo(A[]) in I have the same erasure, yet neither overrides the other
);
}
public void test016() { // 73971
this.runConformTest(
new String[] {
"X.java",
"public class X {\n" +
" static <E extends A> void m(E e) { System.out.print(\"A=\"+e.getClass()); }\n" +
" static <E extends B> void m(E e) { System.out.print(\"B=\"+e.getClass()); }\n" +
" public static void main(String[] args) {\n" +
" m(new A());\n" +
" m(new B());\n" +
" }\n" +
"}\n" +
"class A {}\n" +
"class B extends A {}\n"
},
"A=class AB=class B"
);
}
public void test017() { // 77785
this.runNegativeTest(
new String[] {
"X.java",
"class X<T> {}\n" +
"class Y { void test(X<? extends Number> a) {} }\n" +
"class Z extends Y { void test(X<Number> a) {} }\n"
},
"----------\n" +
"1. ERROR in X.java (at line 3)\r\n" +
" class Z extends Y { void test(X<Number> a) {} }\r\n" +
" ^^^^^^^^^^^^^^^^^\n" +
"Name clash: The method test(X<Number>) of type Z has the same erasure as test(X<? extends Number>) of type Y but does not override it\n" +
"----------\n"
// name clash: test(X<java.lang.Number>) in Z and test(X<? extends java.lang.Number>) in Y have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"X.java",
"class X<T> {}\n" +
"class Y { void test(X<Number> a) {} }\n" +
"class Z extends Y { void test(X<? extends Number> a) {} }\n"
},
"----------\n" +
"1. ERROR in X.java (at line 3)\n" +
" class Z extends Y { void test(X<? extends Number> a) {} }\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Name clash: The method test(X<? extends Number>) of type Z has the same erasure as test(X<Number>) of type Y but does not override it\n" +
"----------\n"
// name clash: test(X<? extends java.lang.Number>) in Z and test(X<java.lang.Number>) in Y have the same erasure, yet neither overrides the other
);
}
public void test018() { // 77861
this.runNegativeTest(
new String[] {
"X.java",
"class X implements Comparable<X> {\n" +
" public int compareTo(Object o) { return 0; }\n" +
" public int compareTo(X o) { return 1; }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 2)\n" +
" public int compareTo(Object o) { return 0; }\n" +
" ^^^^^^^^^^^^^^^^^^^\n" +
"Name clash: The method compareTo(Object) of type X has the same erasure as compareTo(T) of type Comparable<T> but does not override it\n" +
"----------\n"
// name clash: compareTo(java.lang.Object) in X and compareTo(T) in java.lang.Comparable<X> have the same erasure, yet neither overrides the other
);
}
public void test019() { // 78140
this.runConformTest(
new String[] {
"A.java",
"public class A {\n" +
" <T> T get() { return null; } \n" +
"}\n" +
"class B extends A {\n" +
" <T> T get() { return null; } \n" +
"}\n"
},
""
);
}
public void test020() { // 78232
this.runConformTest(
new String[] {
"Test.java",
"public class Test {\n" +
" public static void main(String[] args) {\n" +
" AbstractBase ab = new AbstractBase();\n" +
" Derived d = new Derived();\n" +
" AbstractBase ab2 = new Derived();\n" +
" Visitor<String, String> v = new MyVisitor();\n" +
" System.out.print(ab.accept(v, ab.getClass().getName()));\n" +
" System.out.print('+');\n" +
" System.out.print(d.accept(v, d.getClass().getName()));\n" +
" System.out.print('+');\n" +
" System.out.print(ab2.accept(v, ab2.getClass().getName()));\n" +
" }\n" +
" static class MyVisitor implements Visitor<String, String> {\n" +
" public String visitBase(AbstractBase ab, String obj) { return \"Visited base: \" + obj; }\n" +
" public String visitDerived(Derived d, String obj) { return \"Visited derived: \" + obj; }\n" +
" }\n" +
"}\n" +
"interface Visitor<R, T> {\n" +
" R visitBase(AbstractBase ab, T obj);\n" +
" R visitDerived(Derived d, T obj);\n" +
"}\n" +
"interface Visitable {\n" +
" <R, T> R accept(Visitor<R, T> v, T obj);\n" +
"}\n" +
"class AbstractBase implements Visitable {\n" +
" public <R, T> R accept(Visitor<R, T> v, T obj) { return v.visitBase(this, obj); }\n" +
"}\n" +
"class Derived extends AbstractBase implements Visitable {\n" +
" public <R, T> R accept(Visitor<R, T> v, T obj) { return v.visitDerived(this, obj); }\n" +
"}\n"
},
"Visited base: AbstractBase+Visited derived: Derived+Visited derived: Derived"
);
}
public void test021() {
this.runNegativeTest(
new String[] {
"A.java",
"public class A {\n" +
" public void foo(java.util.Map<String, Class<?>> m) { } \n" +
"}\n",
"B.java",
"class B extends A {\n" +
" @Override void foo(java.util.Map<String, Class<?>> m) { } \n" +
"}\n"
},
"----------\n" +
"1. ERROR in B.java (at line 2)\r\n" +
" @Override void foo(java.util.Map<String, Class<?>> m) { } \r\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Cannot reduce the visibility of the inherited method from A\n" +
"----------\n"
);
// now save A & pick it up as a binary type
this.runConformTest(
new String[] {
"A.java",
"public class A {\n" +
" public void foo(java.util.Map<String, Class<?>> m) { } \n" +
"}\n"
},
""
);
this.runNegativeTest(
new String[] {
"B.java",
"class B extends A {\n" +
" @Override void foo(java.util.Map<String, Class<?>> m) { } \n" +
"}\n"
},
"----------\n" +
"1. ERROR in B.java (at line 2)\r\n" +
" @Override void foo(java.util.Map<String, Class<?>> m) { } \r\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Cannot reduce the visibility of the inherited method from A\n" +
"----------\n",
null,
false,
null
);
}
public void test022() { // 77562
this.runConformTest(
new String[] {
"A.java",
"import java.util.*;\n" +
"class A { List getList() { return null; } }\n" +
"class B extends A { @Override List<String> getList() { return null; } }\n"
},
""
);
this.runNegativeTest(
new String[] {
"A.java",
"import java.util.*;\n" +
"class A { List<String> getList() { return null; } }\n" +
"class B extends A { @Override List getList() { return null; } }\n"
},
"----------\n" +
"1. WARNING in A.java (at line 3)\n" +
" class B extends A { @Override List getList() { return null; } }\n" +
" ^^^^\n" +
"Type safety: The return type List for getList() from the type B needs unchecked conversion to conform to List<String> from the type A\n" +
"----------\n"
// unchecked warning on B.getList()
);
}
public void test023() { // 80739
this.runNegativeTest(
new String[] {
"A.java",
"class A<T> {\n" +
" void foo(T t) {}\n" +
" void foo(String i) {}\n" +
"}\n" +
"class B extends A<String> {}\n"
},
"----------\n" +
"1. ERROR in A.java (at line 5)\r\n" +
" class B extends A<String> {}\r\n" +
" ^\n" +
"Duplicate methods named foo with the parameters (String) and (T) are defined by the type A<String>\n" +
"----------\n"
// methods foo(T) from A<java.lang.String> and foo(java.lang.String) from A<java.lang.String> are inherited with the same signature
);
}
public void test024() { // 80626
this.runConformTest(
new String[] {
"A.java",
"class A {\n" +
" public <E extends Object> void m(E e) {}\n" +
"}\n" +
"class B extends A {\n" +
" public void m(Object e) {}\n" +
"}\n"
},
""
// no complaint
);
this.runNegativeTest(
new String[] {
"A.java",
"class A {\n" +
" public void m(Object e) {}\n" +
"}\n" +
"class B extends A {\n" +
" public <E extends Object> void m(E e) {}\n" +
"}\n"
},
"----------\n" +
"1. ERROR in A.java (at line 5)\r\n" +
" public <E extends Object> void m(E e) {}\r\n" +
" ^^^^^^\n" +
"Name clash: The method m(E) of type B has the same erasure as m(Object) of type A but does not override it\n" +
"----------\n"
// name clash: <E>m(E) in B and m(java.lang.Object) in A have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"A.java",
"class A {\n" +
" public <E extends Object> void m(E e) {}\n" +
"}\n" +
"class B extends A {\n" +
" @Override public void m(Object e) {}\n" +
"}\n" +
"class C extends B {\n" +
" public <E extends Object> void m(E e) {}\n" +
"}\n"
},
"----------\n" +
"1. ERROR in A.java (at line 8)\r\n" +
" public <E extends Object> void m(E e) {}\r\n" +
" ^^^^^^\n" +
"Name clash: The method m(E) of type C has the same erasure as m(Object) of type B but does not override it\n" +
"----------\n"
// name clash: <E>m(E) in C and m(java.lang.Object) in B have the same erasure, yet neither overrides the other
);
}
public void test025() { // 81618
this.runNegativeTest(
new String[] {
"X.java",
"public class X {\n" +
" public static void main(String[] args) {\n" +
" new B().test();\n" +
" }\n" +
"}\n" +
"class A {\n" +
" <T extends Number> T test() { return null; }\n" +
"}\n" +
"class B extends A {\n" +
" @Override Integer test() { return 1; }\n" +
"}\n"
},
"----------\n" +
"1. WARNING in X.java (at line 10)\n" +
" @Override Integer test() { return 1; }\n" +
" ^^^^^^^\n" +
"Type safety: The return type Integer for test() from the type B needs unchecked conversion to conform to T from the type A\n" +
"----------\n"
// warning: test() in B overrides <T>test() in A; return type requires unchecked conversion
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X {\n" +
" public static void main(String[] args) {\n" +
" new B().test();\n" +
" }\n" +
"}\n" +
"class A {\n" +
" <T extends Number> T[] test() { return null; }\n" +
"}\n" +
"class B extends A {\n" +
" @Override Integer[] test() { return new Integer[] {2}; }\n" +
"}\n"
},
"----------\n" +
"1. WARNING in X.java (at line 10)\n" +
" @Override Integer[] test() { return new Integer[] {2}; }\n" +
" ^^^^^^^^^\n" +
"Type safety: The return type Integer[] for test() from the type B needs unchecked conversion to conform to T[] from the type A\n" +
"----------\n"
// warning: test() in B overrides <T>test() in A; return type requires unchecked conversion
);
this.runConformTest(
new String[] {
"X.java",
"public class X {\n" +
" public static void main(String[] args) {\n" +
" System.out.println(new B().<Integer>test(new Integer(1)));\n" +
" }\n" +
"}\n" +
"class A {\n" +
" <T> T test(T t) { return null; }\n" +
"}\n" +
"class B extends A {\n" +
" @Override <T> T test(T t) { return t; }\n" +
"}\n"
},
"1"
);
this.runConformTest(
new String[] {
"X.java",
"public class X {\n" +
" public static void main(String[] args) {\n" +
" System.out.println(new B().<Number>test(1));\n" +
" }\n" +
"}\n" +
"class A<T> {\n" +
" <U> T test(U u) { return null; }\n" +
"}\n" +
"class B extends A<Integer> {\n" +
" @Override <U> Integer test(U u) { return 1; }\n" +
"}\n"
},
"1"
);
this.runConformTest(
new String[] {
"A.java",
"import java.util.concurrent.Callable;\n" +
"public class A {\n" +
" public static void main(String[] args) throws Exception {\n" +
" Callable<Integer> integerCallable = new Callable<Integer>() {\n" +
" public Integer call() { return new Integer(1); }\n" +
" };\n" +
" System.out.println(integerCallable.call());\n" +
" }\n" +
"}\n"
},
"1"
);
this.runNegativeTest(
new String[] {
"X.java",
"interface X<T extends X> { T x(); }\n" +
"abstract class Y<S extends X> implements X<S> { public abstract S x(); }\n" +
"abstract class Z implements X { public abstract X x(); }\n"
},
"" // no warnings
);
this.runNegativeTest(
new String[] {
"X.java",
"interface X<T extends X> { T[] x(); }\n" +
"abstract class Y<S extends X> implements X<S> { public abstract S[] x(); }\n" +
"abstract class Z implements X { public abstract X[] x(); }\n"
},
"" // no warnings
);
}
public void test026() {
this.runConformTest(
new String[] {
"X.java",
"public class X {\n" +
" public static void main(String[] args) {\n" +
" System.out.print(\n" +
" new B().test().getClass() + \" & \"\n" +
" + new C().test().getClass() + \" & \"\n" +
" + new D().test().getClass());\n" +
" }\n" +
"}\n" +
"class A<T extends Number> {\n" +
" A<T> test() { return this; }\n" +
"}\n" +
"class B extends A {\n" +
" A test() { return super.test(); }\n" +
"}\n" +
"class C extends A<Integer> {\n" +
" A<Integer> test() { return super.test(); }\n" +
"}\n" +
"class D<U, V extends Number> extends A<V> {\n" +
" A<V> test() { return super.test(); }\n" +
"}\n"
},
"class B & class C & class D"
);
this.runConformTest(
new String[] {
"A.java",
"public abstract class A<E> {\n" +
" public abstract A<E> test();\n" +
"}\n" +
"class H<K,V> {\n" +
" class M extends A<K> {\n" +
" public A<K> test() { return null; }\n" +
" }\n" +
"}\n"
},
""
);
this.runConformTest(
new String[] {
"X.java",
"public class X extends java.util.AbstractMap {\n" +
" public java.util.Set entrySet() { return null; }\n" +
"}\n"
},
""
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X {\n" +
" public static void main(String[] args) {\n" +
" System.out.print(new C().test().getClass());\n" +
" }\n" +
"}\n" +
"class A<T extends Number> {\n" +
" A<T> test() { return this; }\n" +
"}\n" +
"class C extends A<Integer> {\n" +
" @Override A test() { return super.test(); }\n" +
"}\n"
},
"----------\n" +
"1. WARNING in X.java (at line 10)\n" +
" @Override A test() { return super.test(); }\n" +
" ^\n" +
"Type safety: The return type A for test() from the type C needs unchecked conversion to conform to A<T> from the type A<T>\n" +
"----------\n"
// warning: test() in C overrides test() in A; return type requires unchecked conversion
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=82102
public void test027() {
this.runConformTest(
new String[] {
"X.java",
"public class X { <T> void test() {} }\n" +
"class Y extends X { void test() {} }\n"
},
""
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X { void test() {} }\n" +
"class Y extends X { <T> void test() {} }\n"
},
"----------\n" +
"1. ERROR in X.java (at line 2)\n" +
" class Y extends X { <T> void test() {} }\n" +
" ^^^^^^\n" +
"Name clash: The method test() of type Y has the same erasure as test() of type X but does not override it\n" +
"----------\n"
// name clash: <T>foo() in Y and foo() in X have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X<T> { void test(T o) {} }\n" +
"class Y<T> extends X<T> { void test(Object o) {} }\n"
},
"----------\n" +
"1. ERROR in X.java (at line 2)\r\n" +
" class Y<T> extends X<T> { void test(Object o) {} }\r\n" +
" ^^^^^^^^^^^^^^\n" +
"Name clash: The method test(Object) of type Y<T> has the same erasure as test(T) of type X<T> but does not override it\n" +
"----------\n"
// no error unless you try to do a super send which then fails
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X<T> { void test(T o, T t) {} }\n" +
"class Y<T> extends X<T> { void test(Object o, T t) {} }\n"
},
"----------\n" +
"1. ERROR in X.java (at line 2)\r\n" +
" class Y<T> extends X<T> { void test(Object o, T t) {} }\r\n" +
" ^^^^^^^^^^^^^^^^^^^\n" +
"Name clash: The method test(Object, T) of type Y<T> has the same erasure as test(T, T) of type X<T> but does not override it\n" +
"----------\n"
// name clash: test(java.lang.Object,T) in Y<T> and test(T,T) in X<T> have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X {\n" +
" void test() {\n" +
" Pair<Double, Integer> p = new InvertedPair<Integer, Double>();\n" +
" p.setA(new Double(1.1));\n" +
" }\n" +
"}\n" +
"class Pair<A, B> {\n" +
" public void setA(A a) {}\n" +
"}\n" +
"class InvertedPair<A, B> extends Pair<B, A> {\n" +
" public void setA(A a) {}\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 11)\n" +
" public void setA(A a) {}\n" +
" ^^^^^^^^^\n" +
"Name clash: The method setA(A) of type InvertedPair<A,B> has the same erasure as setA(A) of type Pair<A,B> but does not override it\n" +
"----------\n"
// name clash: setA(A) in InvertedPair<A,B> and setA(A) in Pair<B,A> have the same erasure, yet neither overrides the other
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=81727
public void test028() {
this.runConformTest(
new String[] {
"X.java",
"public class X implements I<X>{\n" +
" public X foo() { return null; }\n" +
"}\n" +
"interface I<T extends I> { T foo(); }\n"
},
""
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=81568
public void test029() {
this.runConformTest(
new String[] {
"I.java",
"public interface I {\n" +
" public I clone();\n" +
"}\n" +
"interface J extends I {}\n"
},
""
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=81535
public void test030() {
java.util.Map options = super.getCompilerOptions();
options.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_1_4);
this.runConformTest(
new String[] {
"X.java",
"import java.io.OutputStreamWriter;\n" +
"import java.io.PrintWriter;\n" +
"public class X extends PrintWriter implements Runnable {\n" +
" public X(OutputStreamWriter out, boolean flag) { super(out, flag); }\n" +
" public void run() {}\n" +
"}\n"
},
"",
null, // use default class-path
false, // do not flush previous output dir content
null, // no special vm args
options,
null
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=80743
public void test031() {
this.runNegativeTest(
new String[] {
"X.java",
"interface X { long hashCode(); }\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" interface X { long hashCode(); }\r\n" +
" ^^^^^^^^^^\n" +
"The return type is incompatible with Object.hashCode()\n" +
"----------\n"
// hashCode() in X cannot override hashCode() in java.lang.Object; attempting to use incompatible return type
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=80736
public void test032() {
// NOTE: javac only reports these errors when the problem type follows the bounds
// if the type X is defined first, then no errors are reported
this.runNegativeTest(
new String[] {
"X.java",
"interface I { Float foo(); }\n" +
"interface J { Integer foo(); }\n" +
"public class X<T extends I&J> {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 3)\r\n" +
" public class X<T extends I&J> {}\r\n" +
" ^\n" +
"The return type is incompatible with J.foo(), I.foo()\n" +
"----------\n"
// types J and I are incompatible; both define foo(), but with unrelated return types
);
this.runNegativeTest(
new String[] {
"X.java",
"interface I { String foo(); }\n" +
"class A { public Object foo() { return null; } }" +
"public class X<T extends A&I> {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 2)\r\n" +
" class A { public Object foo() { return null; } }public class X<T extends A&I> {}\r\n" +
" ^\n" +
"The return type is incompatible with I.foo(), A.foo()\n" +
"----------\n"
// foo() in A cannot implement foo() in I; attempting to use incompatible return type
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=80745
public void test033() {
this.runConformTest(
new String[] {
"X.java",
"interface I { Number foo(); }\n" +
"interface J { Integer foo(); }\n" +
"public class X implements I, J {\n" +
" public Integer foo() {return 1;}\n" +
" public static void main(String argv[]) {\n" +
" I i = null;\n" +
" J j = null;\n" +
" System.out.print(i instanceof J);\n" +
" System.out.print('=');\n" +
" System.out.print(j instanceof I);\n" +
" }\n" +
"}\n"
},
"false=false"
);
this.runConformTest(
new String[] {
"X.java",
"interface I { Number foo(A a); }\n" +
"interface J<T> { Integer foo(A<T> a); }\n" +
"class A<T>{}\n" +
"public class X implements I, J {\n" +
" public Integer foo(A a) {return 1;}\n" +
" public static void main(String argv[]) {\n" +
" I i = null;\n" +
" J j = null;\n" +
" System.out.print(i instanceof J);\n" +
" System.out.print('=');\n" +
" System.out.print(j instanceof I);\n" +
" }\n" +
"}\n"
},
"false=false"
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=81332
public void test034() {
this.runConformTest(
new String[] {
"B.java",
"interface I<E extends Comparable<E>> { void test(E element); }\n" +
"class A implements I<Integer> { public void test(Integer i) {} }\n" +
"public class B extends A { public void test(String i) {} }\n"
},
""
);
this.runConformTest(
new String[] {
"B.java",
"interface I<E extends Comparable> { void test(E element); }\n" +
"class A { public void test(Integer i) {} }\n" +
"public class B extends A implements I<Integer> {}\n" +
"class C extends B { public void test(Object i) {} }\n"
},
""
);
this.runNegativeTest(
new String[] {
"B.java",
"interface I<E extends Comparable> { void test(E element); }\n" +
"class A { public void test(Integer i) {} }\n" +
"public class B extends A implements I<Integer> { public void test(Comparable i) {} }\n"
},
"----------\n" +
"1. ERROR in B.java (at line 3)\n" +
" public class B extends A implements I<Integer> { public void test(Comparable i) {} }\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Name clash: The method test(Comparable) of type B has the same erasure as test(E) of type I<E> but does not override it\n" +
"----------\n"
// name clash: test(java.lang.Comparable) in B and test(E) in I<java.lang.Integer> have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"B.java",
"interface I<E extends Comparable<E>> { void test(E element); }\n" +
"class A implements I<Integer> { public void test(Integer i) {} }\n" +
"public class B extends A { public void test(Comparable i) {} }\n"
},
"----------\n" +
"1. ERROR in B.java (at line 3)\n" +
" public class B extends A { public void test(Comparable i) {} }\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Name clash: The method test(Comparable) of type B has the same erasure as test(E) of type I<E> but does not override it\n" +
"----------\n"
// name clash: test(java.lang.Comparable) in B and test(E) in I<java.lang.Integer> have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"B.java",
"abstract class AA<E extends Comparable> { abstract void test(E element); }\n" +
"class A extends AA<Integer> { @Override public void test(Integer i) {} }\n" +
"public class B extends A { public void test(Comparable i) {} }\n"
},
"----------\n" +
"1. ERROR in B.java (at line 3)\n" +
" public class B extends A { public void test(Comparable i) {} }\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Name clash: The method test(Comparable) of type B has the same erasure as test(E) of type AA<E> but does not override it\n" +
"----------\n"
// name clash: test(java.lang.Comparable) in B and test(E) in AA<java.lang.Integer> have the same erasure, yet neither overrides the other
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=80626
public void test035() {
this.runNegativeTest(
new String[] {
"E.java",
"interface I<U>{ int compareTo(U o); }\n" +
"abstract class F<T extends F<T>> implements I<T>{ public final int compareTo(T o) { return 0; } }\n" +
"public class E extends F<E> { public int compareTo(Object o) { return 0; } }\n"
},
"----------\n" +
"1. ERROR in E.java (at line 3)\n" +
" public class E extends F<E> { public int compareTo(Object o) { return 0; } }\n" +
" ^^^^^^^^^^^^^^^^^^^\n" +
"Name clash: The method compareTo(Object) of type E has the same erasure as compareTo(U) of type I<U> but does not override it\n" +
"----------\n"
// name clash: compareTo(java.lang.Object) in E and compareTo(U) in I<E> have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"X.java",
"public enum X {\n" +
" ;\n" +
" public int compareTo(Object o) { return 0; }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 3)\n" +
" public int compareTo(Object o) { return 0; }\n" +
" ^^^^^^^^^^^^^^^^^^^\n" +
"Name clash: The method compareTo(Object) of type X has the same erasure as compareTo(T) of type Comparable<T> but does not override it\n" +
"----------\n"
// name clash: compareTo(java.lang.Object) in X and compareTo(T) in java.lang.Comparable<X> have the same erasure, yet neither overrides the other
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=83162
public void test036() { // 2 interface cases
// no bridge methods are created in these conform cases so no name clashes can occur
this.runConformTest(
new String[] {
"X.java",
"class X implements Equivalent, EqualityComparable {\n" +
" public boolean equalTo(Object other) { return true; }\n" +
"}\n" +
"abstract class Y implements Equivalent, EqualityComparable {}\n" +
"class Z extends Y {\n" +
" public boolean equalTo(Object other) { return true; }\n" +
"}\n" +
"interface Equivalent<T> { boolean equalTo(T other); }\n" +
"interface EqualityComparable<T> { boolean equalTo(T other); }\n"
},
""
);
this.runConformTest(
new String[] {
"X.java",
"class X implements Equivalent, EqualityComparable {\n" +
" public boolean equalTo(Comparable other) { return true; }\n" +
" public boolean equalTo(Number other) { return true; }\n" +
"}\n" +
"abstract class Y implements Equivalent, EqualityComparable {}\n" +
"class Z extends Y {\n" +
" public boolean equalTo(Comparable other) { return true; }\n" +
" public boolean equalTo(Number other) { return true; }\n" +
"}\n" +
"interface Equivalent<T extends Comparable> { boolean equalTo(T other); }\n" +
"interface EqualityComparable<T extends Number> { boolean equalTo(T other); }\n"
},
""
);
this.runConformTest(
new String[] {
"X.java",
"class X<S> implements Equivalent<S>, EqualityComparable<S> {\n" +
" public boolean equalTo(S other) { return true; }\n" +
"}\n" +
"abstract class Y<S> implements Equivalent<S>, EqualityComparable<S> {}\n" +
"class Z<U> extends Y<U> {\n" +
" public boolean equalTo(U other) { return true; }\n" +
"}\n" +
"interface Equivalent<T> { boolean equalTo(T other); }\n" +
"interface EqualityComparable<T> { boolean equalTo(T other); }\n"
},
""
);
this.runConformTest(
new String[] {
"X.java",
"class X<T extends Comparable, S extends Number> implements Equivalent<T>, EqualityComparable<S> {\n" +
" public boolean equalTo(T other) { return true; }\n" +
" public boolean equalTo(S other) { return true; }\n" +
"}\n" +
"abstract class Y<T extends Comparable, S extends Number> implements Equivalent<T>, EqualityComparable<S> {}\n" +
"class Z<U extends Comparable, V extends Number> extends Y<U, V> {\n" +
" public boolean equalTo(U other) { return true; }\n" +
" public boolean equalTo(V other) { return true; }\n" +
"}\n" +
"interface Equivalent<T extends Comparable> { boolean equalTo(T other); }\n" +
"interface EqualityComparable<S extends Number> { boolean equalTo(S other); }\n"
},
""
);
// in these cases, bridge methods are needed once abstract/concrete methods are defiined (either in the abstract class or a concrete subclass)
this.runConformTest(
new String[] {
"Y.java",
"abstract class Y implements Equivalent<String>, EqualityComparable<Integer> {\n" +
" public abstract boolean equalTo(Number other);\n" +
"}\n" +
"interface Equivalent<T> { boolean equalTo(T other); }\n" +
"interface EqualityComparable<T> { boolean equalTo(T other); }\n"
},
""
// no bridge methods are created here since Y does not define an equalTo(?) method which equals an inherited equalTo method
);
this.runNegativeTest(
new String[] {
"Y.java",
"abstract class Y implements Equivalent<String>, EqualityComparable<Integer> {\n" +
" public abstract boolean equalTo(Object other);\n" +
"}\n" +
"interface Equivalent<T> { boolean equalTo(T other); }\n" +
"interface EqualityComparable<T> { boolean equalTo(T other); }\n"
},
"----------\n" +
"1. ERROR in Y.java (at line 2)\n" +
" public abstract boolean equalTo(Object other);\n" +
" ^^^^^^^^^^^^^^^^^^^^^\n" +
"Name clash: The method equalTo(Object) of type Y has the same erasure as equalTo(T) of type Equivalent<T> but does not override it\n" +
"----------\n" +
"2. ERROR in Y.java (at line 2)\n" +
" public abstract boolean equalTo(Object other);\n" +
" ^^^^^^^^^^^^^^^^^^^^^\n" +
"Name clash: The method equalTo(Object) of type Y has the same erasure as equalTo(T) of type EqualityComparable<T> but does not override it\n" +
"----------\n"
// name clash: equalTo(java.lang.Object) in Y and equalTo(T) in Equivalent<java.lang.String> have the same erasure, yet neither overrides the other
);
// NOTE: javac has a bug, reverse the implemented interfaces & the name clash goes away
// but eventually when a concrete subclass must define the remaining method, the error shows up
this.runNegativeTest(
new String[] {
"Y.java",
"abstract class Y implements Equivalent<String>, EqualityComparable<Integer> {\n" +
" public abstract boolean equalTo(String other);\n" +
"}\n" +
"interface Equivalent<T> { boolean equalTo(T other); }\n" +
"interface EqualityComparable<T> { boolean equalTo(T other); }\n"
},
"----------\n" +
"1. ERROR in Y.java (at line 1)\n" +
" abstract class Y implements Equivalent<String>, EqualityComparable<Integer> {\n" +
" ^\n" +
"Name clash: The method equalTo(T) of type Equivalent<T> has the same erasure as equalTo(T) of type EqualityComparable<T> but does not override it\n" +
"----------\n"
// name clash: equalTo(T) in Equivalent<java.lang.String> and equalTo(T) in EqualityComparable<java.lang.Integer> have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"Y.java",
"abstract class Y implements EqualityComparable<Integer>, Equivalent<String> {\n" +
" public boolean equalTo(Integer other) { return true; }\n" +
"}\n" +
"interface Equivalent<T> { boolean equalTo(T other); }\n" +
"interface EqualityComparable<T> { boolean equalTo(T other); }\n"
},
"----------\n" +
"1. ERROR in Y.java (at line 1)\n" +
" abstract class Y implements EqualityComparable<Integer>, Equivalent<String> {\n" +
" ^\n" +
"Name clash: The method equalTo(T) of type EqualityComparable<T> has the same erasure as equalTo(T) of type Equivalent<T> but does not override it\n" +
"----------\n"
// name clash: equalTo(T) in EqualityComparable<java.lang.Integer> and equalTo(T) in Equivalent<java.lang.String> have the same erasure, yet neither overrides the other
);
}
public void test037() { // test inheritance scenarios
this.runConformTest(
new String[] {
"X.java",
"public abstract class X implements I, J { }\n" +
"abstract class Y implements J, I { }\n" +
"abstract class Z implements K { }\n" +
"class YYY implements J, I { public void foo(A a) {} }\n" +
"class XXX implements I, J { public void foo(A a) {} }\n" +
"class ZZZ implements K { public void foo(A a) {} }\n" +
"interface I { void foo(A a); }\n" +
"interface J { void foo(A<String> a); }\n" +
"interface K extends I { void foo(A<String> a); }\n" +
"class A<T> {}"
},
""
);
this.runNegativeTest(
new String[] {
"XX.java",
"public abstract class XX implements I, J { public abstract void foo(A<String> a); }\n" +
"interface I { void foo(A a); }\n" +
"interface J { void foo(A<String> a); }\n" +
"class A<T> {}"
},
"----------\n" +
"1. ERROR in XX.java (at line 1)\r\n" +
" public abstract class XX implements I, J { public abstract void foo(A<String> a); }\r\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Name clash: The method foo(A<String>) of type XX has the same erasure as foo(A) of type I but does not override it\n" +
"----------\n"
// name clash: foo(A<java.lang.String>) in XX and foo(A) in I have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"XX.java",
"public class XX implements I, J { public void foo(A<String> a) {} }\n" +
"class YY implements J, I { public void foo(A<String> a) {} }\n" +
"class ZZ implements K { public void foo(A<String> a) {} }\n" +
"interface I { void foo(A a); }\n" +
"interface J { void foo(A<String> a); }\n" +
"interface K extends I { void foo(A<String> a); }\n" +
"class A<T> {}"
},
"----------\n" +
"1. ERROR in XX.java (at line 1)\n" +
" public class XX implements I, J { public void foo(A<String> a) {} }\n" +
" ^^\n" +
"The type XX must implement the inherited abstract method I.foo(A)\n" +
"----------\n" +
"2. ERROR in XX.java (at line 1)\n" +
" public class XX implements I, J { public void foo(A<String> a) {} }\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Name clash: The method foo(A<String>) of type XX has the same erasure as foo(A) of type I but does not override it\n" +
"----------\n" +
"3. ERROR in XX.java (at line 2)\n" +
" class YY implements J, I { public void foo(A<String> a) {} }\n" +
" ^^\n" +
"The type YY must implement the inherited abstract method I.foo(A)\n" +
"----------\n" +
"4. ERROR in XX.java (at line 2)\n" +
" class YY implements J, I { public void foo(A<String> a) {} }\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Name clash: The method foo(A<String>) of type YY has the same erasure as foo(A) of type I but does not override it\n" +
"----------\n" +
"5. ERROR in XX.java (at line 3)\n" +
" class ZZ implements K { public void foo(A<String> a) {} }\n" +
" ^^\n" +
"The type ZZ must implement the inherited abstract method I.foo(A)\n" +
"----------\n" +
"6. ERROR in XX.java (at line 3)\n" +
" class ZZ implements K { public void foo(A<String> a) {} }\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Name clash: The method foo(A<String>) of type ZZ has the same erasure as foo(A) of type I but does not override it\n" +
"----------\n"
// XX/YY/ZZ is not abstract and does not override abstract method foo(A) in I
);
this.runNegativeTest(
new String[] {
"X.java",
"public abstract class X extends Y implements I { }\n" +
"interface I { void foo(A a); }\n" +
"class Y { void foo(A<String> a) {} }\n" +
"class A<T> {}"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" public abstract class X extends Y implements I { }\r\n" +
" ^\n" +
"Name clash: The method foo(A<String>) of type Y has the same erasure as foo(A) of type I but does not override it\n" +
"----------\n"
// name clash: foo(A<java.lang.String>) in Y and foo(A) in I have the same erasure, yet neither overrides the other
);
this.runNegativeTest(
new String[] {
"X.java",
"public abstract class X extends Y implements I { }\n" +
"interface I { void foo(A<String> a); }\n" +
"class Y { void foo(A a) {} }\n" +
"class A<T> {}"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" public abstract class X extends Y implements I { }\r\n" +
" ^\n" +
"The inherited method Y.foo(A) cannot hide the public abstract method in I\n" +
"----------\n"
// foo(A) in Y cannot implement foo(A<java.lang.String>) in I; attempting to assign weaker access privileges; was public
);
this.runNegativeTest(
new String[] {
"X.java",
"public abstract class X extends Y implements I { }\n" +
"interface I { <T, S> void foo(T t); }\n" +
"class Y { <T> void foo(T t) {} }\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" public abstract class X extends Y implements I { }\r\n" +
" ^\n" +
"Name clash: The method foo(T) of type Y has the same erasure as foo(T) of type I but does not override it\n" +
"----------\n"
// name clash: <T>foo(T) in Y and <T,S>foo(T) in I have the same erasure, yet neither overrides the other
);
}
public void test038() {
this.runConformTest(
new String[] {
"X.java",
"public class X extends H<Object> { void foo(A<?> a) { super.foo(a); } }\n" +
"class H<T extends Object> { void foo(A<? extends T> a) {} }\n" +
"class A<T> {}"
},
""
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X extends H<Number> { void foo(A<?> a) {} }\n" +
"class H<T extends Number> { void foo(A<? extends T> a) {} }\n" +
"class A<T> {}"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" public class X extends H<Number> { void foo(A<?> a) {} }\r\n" +
" ^^^^^^^^^^^\n" +
"Name clash: The method foo(A<?>) of type X has the same erasure as foo(A<? extends T>) of type H<T> but does not override it\n" +
"----------\n"
// name clash: foo(A<?>) in X and foo(A<? extends T>) in H<java.lang.Number> have the same erasure, yet neither overrides the other
// with public class X extends H<Number> { void foo(A<?> a) { super.foo(a); } }
// foo(A<? extends java.lang.Number>) in H<java.lang.Number> cannot be applied to (A<capture of ?>)
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=83573
public void test039() {
this.runConformTest(
new String[] {
"X.java",
"public class X {\n" +
" public static void main(String[] args) {\n" +
" Test test = new Test();\n" +
" This test2 = new Test();\n" +
" System.out.println(test.get());\n" +
" }\n" +
" interface This {\n" +
" public Object get();\n" +
" }\n" +
" \n" +
" interface That extends This {\n" +
" public String get();\n" +
" \n" +
" }\n" +
" \n" +
" static class Test implements That {\n" +
" \n" +
" public String get() {\n" +
" return \"That\";\n" +
" \n" +
" }\n" +
" }\n" +
"}\n"
},
"That"
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=83218
public void test040() {
this.runNegativeTest(
new String[] {
"Base.java",
"interface Base<E> { Base<E> proc(); }\n" +
"abstract class Derived<D> implements Base<D> { public abstract Derived<D> proc(); }\n"
},
"" // no warnings
);
this.runNegativeTest(
new String[] {
"A.java",
"class A { <T extends Number> T test() { return null; } }\n" +
"class B extends A { @Override Integer test() { return 1; } }\n"
},
"----------\n" +
"1. WARNING in A.java (at line 2)\n" +
" class B extends A { @Override Integer test() { return 1; } }\n" +
" ^^^^^^^\n" +
"Type safety: The return type Integer for test() from the type B needs unchecked conversion to conform to T from the type A\n" +
"----------\n"
// warning: test() in B overrides <T>test() in A; return type requires unchecked conversion
);
this.runNegativeTest(
new String[] {
"A.java",
"import java.util.*;\n" +
"class A { List<String> getList() { return null; } }\n" +
"class B extends A { @Override List getList() { return null; } }\n"
},
"----------\n" +
"1. WARNING in A.java (at line 3)\n" +
" class B extends A { @Override List getList() { return null; } }\n" +
" ^^^^\n" +
"Type safety: The return type List for getList() from the type B needs unchecked conversion to conform to List<String> from the type A\n" +
"----------\n"
// unchecked warning on B.getList()
);
this.runNegativeTest(
new String[] {
"X.java",
"interface X<T> { X<T> x(); }\n" +
"abstract class Y<S> implements X<S> { public abstract X x(); }\n" + // warning: x() in Y implements x() in X; return type requires unchecked conversion
"abstract class Z implements X { public abstract X x(); }\n"
},
"----------\n" +
"1. WARNING in X.java (at line 2)\n" +
" abstract class Y<S> implements X<S> { public abstract X x(); }\n" +
" ^\n" +
"Type safety: The return type X for x() from the type Y<S> needs unchecked conversion to conform to X<T> from the type X<T>\n" +
"----------\n"
);
this.runNegativeTest(
new String[] {
"X.java",
"interface X<T> { X<T>[] x(); }\n" +
"abstract class Y<S> implements X<S> { public abstract X[] x(); }\n" + // warning: x() in Y implements x() in X; return type requires unchecked conversion
"abstract class Z implements X { public abstract X[] x(); }\n"
},
"----------\n" +
"1. WARNING in X.java (at line 2)\n" +
" abstract class Y<S> implements X<S> { public abstract X[] x(); }\n" +
" ^^^\n" +
"Type safety: The return type X[] for x() from the type Y<S> needs unchecked conversion to conform to X<T>[] from the type X<T>\n" +
"----------\n"
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=83902
public void test041() { // inherited cases for bridge methods, varargs clashes, return type conversion checks
this.runNegativeTest(
new String[] {
"X.java",
"public class X { public void foo(String... n) {} }\n" +
"interface I { void foo(String[] n); }\n" +
"class Y extends X implements I { }\n"
},
"----------\n" +
"1. WARNING in X.java (at line 3)\n" +
" class Y extends X implements I { }\n" +
" ^\n" +
"Varargs methods should only override other varargs methods unlike X.foo(String...) and I.foo(String[])\n" +
"----------\n"
// warning: foo(java.lang.String...) in X cannot implement foo(java.lang.String[]) in I; overridden method has no '...'
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X { public void foo(String[] n) {} }\n" +
"interface I { void foo(String... n); }\n" +
"class Y extends X implements I { }\n"
},
"----------\n" +
"1. WARNING in X.java (at line 3)\n" +
" class Y extends X implements I { }\n" +
" ^\n" +
"Varargs methods should only override other varargs methods unlike X.foo(String[]) and I.foo(String...)\n" +
"----------\n"
// warning: foo(java.lang.String[]) in X cannot implement foo(java.lang.String...) in I; overriding method is missing '...'
);
this.runConformTest(
new String[] {
"X.java",
"public class X {\n" +
" public Y foo() {\n" +
" System.out.println(\"SUCCESS\");\n" +
" return null;\n" +
" }\n" +
" public static void main(String[] args) {\n" +
" ((I) new Y()).foo();\n" +
" }\n" +
"}\n" +
"interface I { X foo(); }\n" +
"class Y extends X implements I { }\n"
},
"SUCCESS"
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X { public A foo() { return null; } }\n" +
"interface I { A<String> foo(); }\n" +
"class Y extends X implements I { }\n" +
"class A<T> { }\n"
},
"----------\n" +
"1. WARNING in X.java (at line 3)\n" +
" class Y extends X implements I { }\n" +
" ^\n" +
"Type safety: The return type A for foo() from the type X needs unchecked conversion to conform to A<String> from the type I\n" +
"----------\n"
// warning: foo() in X implements foo() in I; return type requires unchecked conversion
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X { public Object foo() { return null; } }\n" +
"interface I { <T> T foo(); }\n" +
"class Y extends X implements I { }\n"
},
"----------\n" +
"1. WARNING in X.java (at line 3)\n" +
" class Y extends X implements I { }\n" +
" ^\n" +
"Type safety: The return type Object for foo() from the type X needs unchecked conversion to conform to T from the type I\n" +
"----------\n"
// NOTE: javac issues an error & a warning which contradict each other
// if the method Object foo() is implemented in Y then only the warning is issued, so X should be allowed to implement the method
// Y is not abstract and does not override abstract method <T>foo() in I
// warning: foo() in X implements <T>foo() in I; return type requires unchecked conversion
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=85930
public void test042() {
this.runConformTest(
new String[] {
"X.java",
"interface Callable<T>\n" +
"{\n" +
" public enum Result { GOOD, BAD };\n" +
" public Result call(T arg);\n" +
"}\n" +
"\n" +
"public class X implements Callable<String>\n" +
"{\n" +
" public Result call(String arg) { return Result.GOOD; } // Warning line\n" +
"}\n"
},
""
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=72704
public void test043() { // ambiguous message sends because of substitution from 2 different type variables
this.runNegativeTest(
new String[] {
"X.java",
"public class X { void test(E<Integer,Integer> e) { e.id(new Integer(1)); } }\n" +
"abstract class C<A> { public abstract void id(A x); }\n" +
"interface I<B> { void id(B x); }\n" +
"abstract class E<A, B> extends C<A> implements I<B> {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 4)\r\n" +
" abstract class E<A, B> extends C<A> implements I<B> {}\r\n" +
" ^\n" +
"Name clash: The method id(A) of type C<A> has the same erasure as id(B) of type I<B> but does not override it\n" +
"----------\n"
// javac won't report it until C.id() is made concrete or implemented in E
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X { void test(E<Integer,Integer> e) { e.id(new Integer(2)); } }\n" +
"abstract class C<A extends Number> { public abstract void id(A x); }\n" +
"interface I<B> { void id(B x); }\n" +
"abstract class E<A extends Number, B> extends C<A> implements I<B> {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" public class X { void test(E<Integer,Integer> e) { e.id(new Integer(2)); } }\r\n" +
" ^^\n" +
"The method id(Integer) is ambiguous for the type E<Integer,Integer>\n" +
"----------\n"
// reference to id is ambiguous, both method id(A) in C<java.lang.Integer> and method id(B) in I<java.lang.Integer> match
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X { void test(E<Integer,Integer> e) { e.id(new Integer(111)); } }\n" +
"abstract class C<A extends Number> { public void id(A x) {} }\n" +
"interface I<B> { void id(B x); }\n" +
"class E<A extends Number, B> extends C<A> implements I<B> { public void id(B b) {} }\n"
},
"----------\n" +
"1. ERROR in X.java (at line 1)\r\n" +
" public class X { void test(E<Integer,Integer> e) { e.id(new Integer(111)); } }\r\n" +
" ^^\n" +
"The method id(Integer) is ambiguous for the type E<Integer,Integer>\n" +
"----------\n"
// reference to id is ambiguous, both method id(A) in C<java.lang.Integer> and method id(B) in E<java.lang.Integer,java.lang.Integer> match
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X {\n" +
" void test(E<Integer,Integer> e) { e.id(new Integer(111)); }\n" +
" void test(M<Integer,Integer> m) {\n" +
" m.id(new Integer(111));\n" +
" ((E<Integer, Integer>) m).id(new Integer(111));\n" +
" }\n" +
" void test(N<Integer> n) { n.id(new Integer(111)); }\n" +
"}\n" +
"abstract class C<A extends Number> { public void id(A x) {} }\n" +
"interface I<B> { void id(B x); }\n" +
"abstract class E<A extends Number, B> extends C<A> implements I<B> {}\n" +
"class M<A extends Number, B> extends E<A, B> { public void id(B b) {} }\n" +
"abstract class N<T extends Number> extends E<T, Number> { @Override public void id(T n) {} }\n"
},
"----------\n" +
"1. ERROR in X.java (at line 4)\r\n" +
" m.id(new Integer(111));\r\n" +
" ^^\n" +
"The method id(Integer) is ambiguous for the type M<Integer,Integer>\n" +
"----------\n"
// reference to id is ambiguous, both method id(A) in C<java.lang.Integer> and method id(B) in M<java.lang.Integer,java.lang.Integer> match
);
}
// ensure AccOverriding remains when attempting to override final method
public void test044() {
this.runNegativeTest(
new String[] {
"X.java",
"public class X { final void foo() {} }\n" +
"class XS extends X { @Override void foo() {} }\n"
},
"----------\n" +
"1. ERROR in X.java (at line 2)\n" +
" class XS extends X { @Override void foo() {} }\n" +
" ^^^^^\n" +
"Cannot override the final method from X\n" +
"----------\n"
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X { public void foo() {} }\n" +
"class XS extends X { @Override void foo() {} }\n"
},
"----------\n" +
"1. ERROR in X.java (at line 2)\n" +
" class XS extends X { @Override void foo() {} }\n" +
" ^^^^^\n" +
"Cannot reduce the visibility of the inherited method from X\n" +
"----------\n"
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X { void foo() {} }\n" +
"class XS extends X { @Override void foo() throws ClassNotFoundException {} }\n"
},
"----------\n" +
"1. ERROR in X.java (at line 2)\n" +
" class XS extends X { @Override void foo() throws ClassNotFoundException {} }\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Exception ClassNotFoundException is not compatible with throws clause in X.foo()\n" +
"----------\n"
);
this.runNegativeTest(
new String[] {
"X.java",
"public class X { void foo() {} }\n" +
"class XS extends X { @Override int foo() {} }\n"
},
"----------\n" +
"1. ERROR in X.java (at line 2)\n" +
" class XS extends X { @Override int foo() {} }\n" +
" ^^^^^\n" +
"The return type is incompatible with X.foo()\n" +
"----------\n" +
"2. ERROR in X.java (at line 2)\n" +
" class XS extends X { @Override int foo() {} }\n" +
" ^^^^^\n" +
"The method foo() of type XS must override a superclass method\n" +
"----------\n"
);
}
public void test045() {
this.runConformTest(
new String[] {
"X.java",
"class Foo {}\n" +
"\n" +
"interface Bar {\n" +
" Foo get(Class<?> c);\n" +
"}\n" +
"public class X implements Bar {\n" +
" public Foo get(Class c) { return null; }\n" +
"}\n"
},
""
);
}
// ensure no unchecked warning
public void test046() {
this.runNegativeTest(
new String[] {
"X.java",
"interface IX <T> {\n" +
" public T doSomething();\n" +
"}\n" +
"public class X implements IX<Integer> {\n" +
" Zork z;\n" +
" public Integer doSomething() {\n" +
" return null;\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 5)\n" +
" Zork z;\n" +
" ^^^^\n" +
"Zork cannot be resolved to a type\n" +
"----------\n");
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=87157
public void test047() {
this.runConformTest(
new String[] {
"X.java",
"interface Interface {\n" +
" Number getValue();\n" +
"}\n" +
"class C1 {\n" +
" public Double getValue() {\n" +
" return 0.0;\n" +
" }\n" +
"}\n" +
"public class X extends C1 implements Interface{\n" +
" public static void main(String[] args) {\n" +
" Interface i=new X();\n" +
" System.out.println(i.getValue());\n" +
" }\n" +
"}\n"
},
"0.0");
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=85900
public void test048() {
this.runConformTest(
new String[] {
"X1.java",
"import java.util.*;\n" +
"public class X1 extends LinkedHashMap<String, String> {\n" +
" public Object putAll(Map<String,String> a) { return null; }\n" +
"}\n"
},
""
);
this.runConformTest(
new String[] {
"X2.java",
"public class X2 extends Y<String> {\n" +
" public Object foo(I<String> z) { return null; }\n" +
"}\n" +
"class Y<T> implements I<T> {\n" +
" public void foo(I<? extends T> a) {}\n" +
"}\n" +
"interface I<T> {\n" +
" public void foo(I<? extends T> a);\n" +
"}\n"
},
""
);
this.runNegativeTest(
new String[] {
"X3.java",
"public class X3 extends Y<String> {\n" +
" public void foo(I<String> z) {}\n" +
"}\n" +
"class Y<T> implements I<T> {\n" +
" public void foo(I<? extends T> a) {}\n" +
"}\n" +
"interface I<T> {\n" +
" public void foo(I<? extends T> a);\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X3.java (at line 2)\r\n" +
" public void foo(I<String> z) {}\r\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Name clash: The method foo(I<String>) of type X3 has the same erasure as foo(I<? extends T>) of type Y<T> but does not override it\n" +
"----------\n"
// name clash: foo(I<java.lang.String>) in X and foo(I<? extends T>) in Y<java.lang.String> have the same erasure, yet neither overrides the other
);
this.runConformTest(
new String[] {
"X4.java",
"public class X4 extends Y<String> {\n" +
" public String foo(I<String> z) { return null; }\n" +
"}\n" +
"class Y<T> implements I<T> {\n" +
" public Object foo(I<? extends T> a) { return null; }\n" +
"}\n" +
"interface I<T> {\n" +
" public Object foo(I<? extends T> a);\n" +
"}\n"
},
""
);
this.runConformTest(
new String[] {
"X5.java",
"public class X5 extends Y<String> {\n" +
" public Object foo(I<String> z) { return null; }\n" +
"}\n" +
"class Y<T> implements I<T> {\n" +
" public String foo(I<? extends T> a) { return null; }\n" +
"}\n" +
"interface I<T> {\n" +
" public String foo(I<? extends T> a);\n" +
"}\n"
},
""
);
this.runConformTest(
new String[] {
"X6.java",
"public class X6 extends Y<String> {\n" +
" public void foo(I<String> z) {}\n" +
"}\n" +
"class Y<T> implements I<T> {\n" +
" public Object foo(I<? extends T> a) { return null; }\n" +
"}\n" +
"interface I<T> {\n" +
" public Object foo(I<? extends T> a);\n" +
"}\n"
},
""
);
this.runConformTest(
new String[] {
"X7.java",
"public class X7 extends Y<String> {\n" +
" public String foo(I<String> z) { return null; }\n" +
"}\n" +
"class Y<T> implements I<T> {\n" +
" public T foo(I<? extends T> a) { return null; }\n" +
"}\n" +
"interface I<T> {\n" +
" public T foo(I<? extends T> a);\n" +
"}\n"
},
""
);
this.runNegativeTest(
new String[] {
"X8.java",
"public class X8 extends Y<String> {\n" +
" public Object foo(I<String> z) { return null; }\n" +
"}\n" +
"class Y<T> implements I<T> {\n" +
" public T foo(I<? extends T> a) { return null; }\n" +
"}\n" +
"interface I<T> {\n" +
" public T foo(I<? extends T> a);\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X8.java (at line 2)\r\n" +
" public Object foo(I<String> z) { return null; }\r\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Name clash: The method foo(I<String>) of type X8 has the same erasure as foo(I<? extends T>) of type Y<T> but does not override it\n" +
"----------\n"
// name clash: foo(I<java.lang.String>) in X7 and foo(I<? extends T>) in Y<java.lang.String> have the same erasure, yet neither overrides the other
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=88094
public void test049() {
this.runNegativeTest(
new String[] {
"X.java",
"public class X<T> {\n" +
" T id(T x) { return x; }\n" +
" A id(A x) { return x; }\n" +
"}\n" +
"class Y<T extends A> extends X<T> {\n" +
" @Override T id(T x) { return x; }\n" +
" @Override A id(A x) { return x; }\n" +
"}\n" +
"class A {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 5)\n" +
" class Y<T extends A> extends X<T> {\n" +
" ^\n" +
"Name clash: The method id(A) of type X<T> has the same erasure as id(T) of type X<T> but does not override it\n" +
"----------\n" +
"2. ERROR in X.java (at line 6)\n" +
" @Override T id(T x) { return x; }\n" +
" ^^^^^^^\n" +
"Method id(T) has the same erasure id(A) as another method in type Y<T>\n" +
"----------\n" +
"3. ERROR in X.java (at line 7)\n" +
" @Override A id(A x) { return x; }\n" +
" ^^^^^^^\n" +
"Duplicate method id(A) in type Y<T>\n" +
"----------\n"
// id(T) is already defined in Y
// id(java.lang.String) in Y overrides id(T) in X; return type requires unchecked conversion
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=90423
public void test050() {
this.runConformTest(
new String[] {
"X.java",
"public class X {\n" +
" public static <S extends String> S foo() { \n" +
" System.out.print(\"String\"); \n" +
" return null; \n" +
" }\n" +
" public static <N extends Number> N foo() { \n" +
" System.out.print(\"Number\");\n" +
" return null; \n" +
" }\n" +
" public static void main(String[] args) {\n" +
" X.<String>foo();\n" +
" X.<Number>foo();\n" +
" X o = new X();\n" +
" o.<Number>foo();\n" +
" }\n" +
"}\n"
},
"StringNumberNumber");
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=90423 - variation
public void test051() {
this.runNegativeTest(
new String[] {
"X.java",
"import java.util.List;\n" +
"\n" +
"public class X {\n" +
"\n" +
" class C1 {\n" +
" Integer foo(Object o) { return null; } // duplicate\n" +
" String foo(Object o) { return null; } // duplicate\n" +
" }\n" +
" class C2 {\n" +
" <T extends Integer> T foo(Object o) { return null; } // ok\n" +
" <T extends String> T foo(Object o) { return null; } // ok\n" +
" }\n" +
" class C3 {\n" +
" Integer foo(Object o) { return null; } // duplicate\n" +
" <T extends String> T foo(Object o) { return null; } // duplicate\n" +
" }\n" +
" class C4 {\n" +
" List<Integer> foo(Object o) { return null; } // duplicate\n" +
" List<String> foo(Object o) { return null; } // duplicate\n" +
" }\n" +
" class C5 {\n" +
" List<Integer> foo(List<Integer> o) { return null; } // duplicate\n" +
" List<String> foo(List<String> o) { return null; } // duplicate\n" +
" }\n" +
" class C6 {\n" +
" <T extends Integer> T foo(List<Integer> o) { return null; } // ok\n" +
" <T extends String> T foo(List<String> o) { return null; } // ok\n" +
" }\n" +
" class C7 {\n" +
" <T extends Integer, U> T foo(Object o) { return null; } // ok\n" +
" <T extends String> T foo(Object o) { return null; } // ok\n" +
" } \n" +
" public static void main(String[] args) {\n" +
"// new X().new C2().foo((List<String>) null);\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 6)\n" +
" Integer foo(Object o) { return null; } // duplicate\n" +
" ^^^^^^^^^^^^^\n" +
"Duplicate method foo(Object) in type X.C1\n" +
"----------\n" +
"2. ERROR in X.java (at line 7)\n" +
" String foo(Object o) { return null; } // duplicate\n" +
" ^^^^^^^^^^^^^\n" +
"Duplicate method foo(Object) in type X.C1\n" +
"----------\n" +
"3. WARNING in X.java (at line 10)\n" +
" <T extends Integer> T foo(Object o) { return null; } // ok\n" +
" ^^^^^^^\n" +
"The type parameter T should not be bounded by the final type Integer. Final types cannot be further extended\n" +
"----------\n" +
"4. WARNING in X.java (at line 11)\n" +
" <T extends String> T foo(Object o) { return null; } // ok\n" +
" ^^^^^^\n" +
"The type parameter T should not be bounded by the final type String. Final types cannot be further extended\n" +
"----------\n" +
"5. ERROR in X.java (at line 14)\n" +
" Integer foo(Object o) { return null; } // duplicate\n" +
" ^^^^^^^^^^^^^\n" +
"Duplicate method foo(Object) in type X.C3\n" +
"----------\n" +
"6. WARNING in X.java (at line 15)\n" +
" <T extends String> T foo(Object o) { return null; } // duplicate\n" +
" ^^^^^^\n" +
"The type parameter T should not be bounded by the final type String. Final types cannot be further extended\n" +
"----------\n" +
"7. ERROR in X.java (at line 15)\n" +
" <T extends String> T foo(Object o) { return null; } // duplicate\n" +
" ^^^^^^^^^^^^^\n" +
"Duplicate method foo(Object) in type X.C3\n" +
"----------\n" +
"8. ERROR in X.java (at line 18)\n" +
" List<Integer> foo(Object o) { return null; } // duplicate\n" +
" ^^^^^^^^^^^^^\n" +
"Duplicate method foo(Object) in type X.C4\n" +
"----------\n" +
"9. ERROR in X.java (at line 19)\n" +
" List<String> foo(Object o) { return null; } // duplicate\n" +
" ^^^^^^^^^^^^^\n" +
"Duplicate method foo(Object) in type X.C4\n" +
"----------\n" +
"10. ERROR in X.java (at line 22)\n" +
" List<Integer> foo(List<Integer> o) { return null; } // duplicate\n" +
" ^^^^^^^^^^^^^^^^^^^^\n" +
"Duplicate method foo(List<Integer>) in type X.C5\n" +
"----------\n" +
"11. ERROR in X.java (at line 23)\n" +
" List<String> foo(List<String> o) { return null; } // duplicate\n" +
" ^^^^^^^^^^^^^^^^^^^\n" +
"Duplicate method foo(List<String>) in type X.C5\n" +
"----------\n" +
"12. WARNING in X.java (at line 26)\n" +
" <T extends Integer> T foo(List<Integer> o) { return null; } // ok\n" +
" ^^^^^^^\n" +
"The type parameter T should not be bounded by the final type Integer. Final types cannot be further extended\n" +
"----------\n" +
"13. WARNING in X.java (at line 27)\n" +
" <T extends String> T foo(List<String> o) { return null; } // ok\n" +
" ^^^^^^\n" +
"The type parameter T should not be bounded by the final type String. Final types cannot be further extended\n" +
"----------\n" +
"14. WARNING in X.java (at line 30)\n" +
" <T extends Integer, U> T foo(Object o) { return null; } // ok\n" +
" ^^^^^^^\n" +
"The type parameter T should not be bounded by the final type Integer. Final types cannot be further extended\n" +
"----------\n" +
"15. WARNING in X.java (at line 31)\n" +
" <T extends String> T foo(Object o) { return null; } // ok\n" +
" ^^^^^^\n" +
"The type parameter T should not be bounded by the final type String. Final types cannot be further extended\n" +
"----------\n");
}
}
