1 /* 2 * Copyright (c) 2012, 2013, 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 import org.testng.annotations.Test; 25 26 import java.util.function.IntFunction; 27 import java.util.function.Supplier; 28 29 import static org.testng.Assert.assertTrue; 30 31 /** 32 * ArrayCtorRefTest 33 * 34 * @author Brian Goetz 35 */ 36 @Test 37 public class ArrayCtorRefTest { 38 interface ArrayMaker<T> { make(int size)39 public T[] make(int size); 40 } 41 emptyArrayFactory(ArrayMaker<T> maker)42 private static<T> Supplier<T[]> emptyArrayFactory(ArrayMaker<T> maker) { 43 return () -> maker.make(0); 44 } 45 testLambda()46 public void testLambda() { 47 ArrayMaker<String> am = i -> new String[i]; 48 String[] arr = am.make(3); 49 arr[0] = "Foo"; 50 assertTrue(arr instanceof String[]); 51 assertTrue(arr.length == 3); 52 } 53 testIntCtorRef()54 public void testIntCtorRef() { 55 IntFunction<int[]> factory = int[]::new; 56 int[] arr = factory.apply(6); 57 assertTrue(arr.length == 6); 58 } 59 testLambdaInference()60 public void testLambdaInference() { 61 Supplier<Object[]> oF = emptyArrayFactory(i -> new Object[i]); 62 Supplier<String[]> sF = emptyArrayFactory(i -> new String[i]); 63 assertTrue(oF.get() instanceof Object[]); 64 assertTrue(sF.get() instanceof String[]); 65 } 66 testCtorRef()67 public void testCtorRef() { 68 ArrayMaker<String> am = String[]::new; 69 String[] arr = am.make(3); 70 arr[0] = "Foo"; 71 assertTrue(arr instanceof String[]); 72 assertTrue(arr.length == 3); 73 } 74 } 75