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 8048121 27 * @summary javac complex method references: revamp and simplify 28 * 29 * Make sure that the method reference receiver is evaluated exactly once 30 * even in this bridging case. 31 */ 32 33 public class MethodRefSingleRefEvalBridge { 34 35 interface SAM { 36 int m(); 37 } 38 39 class ZZ { 40 // private to force bridging 41 private int four() { return 4; } 42 } 43 44 static int count = 0; 45 ZZ azz = new ZZ(); 46 47 static void assertEqual(int expected, int got) { 48 if (got != expected) 49 throw new AssertionError("Expected " + expected + " got " + got); 50 } 51 52 public static void main(String[] args) { 53 new MethodRefSingleRefEvalBridge().test(); 54 } 55 56 ZZ check() { 57 count++; 58 return azz; 59 } 60 61 void test() { 62 count = 0; 63 SAM s = check()::four; 64 assertEqual(1, count); 65 66 count = 0; 67 assertEqual(4, s.m()); 68 assertEqual(0, count); 69 } 70} 71