1 /*
2 * Copyright (c) 2012, 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 7062745 7157798
27 * @summary Test inheritance of same-name methods from multiple interfaces
28 when the methods have compatible parameter types and return types
29 * @compile Test2.java
30 */
31
32 import java.util.*;
33
m(Map map)34 interface A { void m(Map map); }
m(Map<Number, String> map)35 interface B { void m(Map<Number, String> map); }
36
37 interface AB extends A, B {} //paramter type: Map<Number, String>
38
getList(Map<K, V> map)39 interface C<K, V> { List<V> getList(Map<K, V> map); }
getList(Map map)40 interface D { ArrayList getList(Map map); }
41
42 interface CD<K, V> extends C<K, V>, D {} //paramter type: Map<K, V>
43
get(List<?> list)44 interface E<T> { T get(List<?> list); }
get(List list)45 interface F<T> { T get(List list); }
46
47 interface EF<T1, T2 extends T1> extends E<T1>, F<T2> {} //parameter type: List<?>
48
49 class Test2 {
50
51 //compatible parameter types:
test(AB ab)52 void test(AB ab) {
53 ab.m(new HashMap<Number, String>());
54 }
55
56 //compatible parameter types and return types:
testRaw(CD cd)57 void testRaw(CD cd) { //return type: ArrayList
58 ArrayList al = cd.getList(new HashMap());
59 }
60
testGeneric(CD<K, V> cd)61 <K, V> void testGeneric(CD<K, V> cd) { //return type: List<V>
62 V v = cd.getList(new HashMap<K, V>()).get(0);
63 }
64
test(CD<Number, String> cd)65 void test(CD<Number, String> cd) { //return type: List<String>
66 String s = cd.getList(new HashMap<Number, String>()).get(0);
67 }
68
test(EF<Number, Integer> ef)69 void test(EF<Number, Integer> ef) { //return type: Number
70 Number n = ef.get(new ArrayList<Integer>());
71 }
72
testGeneric(EF<T, U> ef)73 <T, U extends T> void testGeneric(EF<T, U> ef) { //return type: T
74 T t = ef.get(new ArrayList<U>());
75 }
76 }
77