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 */ 23 24 /** 25 * @test 26 * @bug 8003280 27 * @summary Add lambda tests 28 * Test constructor reference 29 * @compile MethodRef4.java 30 * @run main MethodRef4 31 */ 32 33 public class MethodRef4 { 34 m()35 static interface A {Fee<String> m();} 36 m(String s)37 static interface B {Fee<String> m(String s);} 38 m()39 static interface C {Object m();} 40 41 static class Fee<T> { 42 43 private T t; 44 Fee()45 public Fee() { 46 System.out.println("Fee<T> instantiated"); 47 } 48 Fee(T t)49 public Fee(T t) { 50 this.t = t; 51 System.out.println("Fee<T> instantiated: " + t); 52 } 53 make()54 public void make() { 55 System.out.println(this + ": make()"); 56 } 57 } 58 assertTrue(boolean cond)59 private static void assertTrue(boolean cond) { 60 if (!cond) 61 throw new AssertionError(); 62 } 63 main(String[] args)64 public static void main(String[] args) { 65 66 A a = Fee<String>::new; //constructor reference to Fee<T>() 67 a.m().make(); 68 69 B b = Fee<String>::new; //constructor reference to Fee<T>(String) 70 b.m("hi").make(); 71 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 } 80