Fri, 30 Nov 2012 15:14:25 +0000
8004102: Add support for generic functional descriptors
Summary: Method references are allowed to have a generic functional interface descriptor target
Reviewed-by: jjg
1 /*
2 * Copyright (c) 2011, 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 */
24 /**
25 * @test
26 * @bug 8003280
27 * @summary Add lambda tests
28 * Test constructor reference
29 * @compile MethodRef4.java
30 * @run main MethodRef4
31 */
33 public class MethodRef4 {
35 static interface A {Fee<String> m();}
37 static interface B {Fee<String> m(String s);}
39 static interface C {Object m();}
41 static class Fee<T> {
43 private T t;
45 public Fee() {
46 System.out.println("Fee<T> instantiated");
47 }
49 public Fee(T t) {
50 this.t = t;
51 System.out.println("Fee<T> instantiated: " + t);
52 }
54 public void make() {
55 System.out.println(this + ": make()");
56 }
57 }
59 private static void assertTrue(boolean cond) {
60 if (!cond)
61 throw new AssertionError();
62 }
64 public static void main(String[] args) {
66 A a = Fee<String>::new; //constructor reference to Fee<T>()
67 a.m().make();
69 B b = Fee<String>::new; //constructor reference to Fee<T>(String)
70 b.m("hi").make();
72 C c = MethodRef4::new; //constructor reference to MethodRef4()
73 assertTrue( c.m() instanceof MethodRef4 );
74 c = MethodRef4::new; //constructor reference to MethodRef4()
75 assertTrue( c.m() instanceof MethodRef4 );
76 c = Fee<String>::new; //constructor reference to Fee<T>()
77 assertTrue( c.m() instanceof Fee );
78 }
79 }