1 /*
2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.
8  *
9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 
24 /**
25  * @test
26  * @bug 8041663
27  */
28 
29 public class AmbiguityErrorTest {
30 
31     public interface A { }
32 
33     public interface B extends A { }
34 
35     public interface C {
m(B strategy)36         A m(B strategy);
37     }
38 
39     public interface D {
m(A strategy)40         A m(A strategy);
m(B strategy)41         A m(B strategy);
42     }
43 
44     public interface T1 extends C, D { }
45     public interface T2 extends D, C { }
46 
47     int count;
48 
49     class T1Impl implements T1, T2 {
m(B strategy)50         public A m(B strategy) {
51             count++;
52             return null;
53         }
m(A strategy)54         public A m(A strategy) {
55             throw new AssertionError("Should not get here.");
56         }
57     }
58 
main(String... args)59     public static void main(String... args) {
60         new AmbiguityErrorTest().test();
61     }
62 
test()63     void test() {
64         T1 t1 = new T1Impl();
65         T2 t2 = new T1Impl();
66         final B b = new B() { };
67         t1.m(b);
68         t2.m(b);
69 
70         if (count != 2) {
71             throw new IllegalStateException("Did not call the methods properly");
72         }
73     }
74 
75 }
76