Mercurial > jdk8-mips64-public > langtools / file comparison
comparison: test/tools/javac/lambda/lambdaExpression/LambdaTest1.java
test/tools/javac/lambda/lambdaExpression/LambdaTest1.java
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| 1 /* | |
| 2 * Copyright (c) 2011, 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 8003280 | |
| 27 * @summary Add lambda tests | |
| 28 * Test lambda expressions for existing SAM interfaces like Runnable and Comparator<T> | |
| 29 * @compile LambdaTest1.java | |
| 30 * @run main LambdaTest1 | |
| 31 */ | |
| 32 | |
| 33 import java.util.Collections; | |
| 34 import java.util.List; | |
| 35 import java.util.ArrayList; | |
| 36 | |
| 37 public class LambdaTest1 { | |
| 38 | |
| 39 private static String assertionStr = ""; | |
| 40 | |
| 41 private static void assertTrue(boolean b) { | |
| 42 if(!b) | |
| 43 throw new AssertionError(); | |
| 44 } | |
| 45 | |
| 46 private static void test1(Runnable r) { | |
| 47 r.run(); | |
| 48 } | |
| 49 | |
| 50 void test2(Object o) { | |
| 51 if(o instanceof Runnable) | |
| 52 ((Runnable)o).run(); | |
| 53 } | |
| 54 | |
| 55 Runnable test3() { | |
| 56 return ()-> { assertionStr += "Runnable6"; }; | |
| 57 } | |
| 58 | |
| 59 public static void main(String[] args) { | |
| 60 | |
| 61 //lambda expressions for SAM interface Runnable: | |
| 62 //assign: | |
| 63 Runnable r = ()-> { assertionStr += "Runnable1 "; }; | |
| 64 r.run(); | |
| 65 | |
| 66 //cast: | |
| 67 ((Runnable)()-> { assertionStr += "Runnable2 "; }).run(); | |
| 68 | |
| 69 Object o = (Runnable)()-> {}; | |
| 70 | |
| 71 o = (Runnable)()-> { | |
| 72 switch (assertionStr) { | |
| 73 case "Runnable1 Runnable2 ": | |
| 74 assertionStr += "Runnable3 "; | |
| 75 break; | |
| 76 default: | |
| 77 throw new AssertionError(); | |
| 78 } | |
| 79 return; | |
| 80 }; | |
| 81 | |
| 82 //method parameter: | |
| 83 test1(()-> { assertionStr += "Runnable4 "; return; }); | |
| 84 | |
| 85 LambdaTest1 test = new LambdaTest1(); | |
| 86 test.test2((Runnable)()-> { assertionStr += "Runnable5 "; }); | |
| 87 | |
| 88 //return type: | |
| 89 r = test.test3(); | |
| 90 r.run(); | |
| 91 | |
| 92 assertTrue(assertionStr.equals("Runnable1 Runnable2 Runnable4 Runnable5 Runnable6")); | |
| 93 | |
| 94 //lambda expressions for SAM interface Comparator<T>: | |
| 95 List<Integer> list = new ArrayList<Integer>(); | |
| 96 list.add(4); | |
| 97 list.add(10); | |
| 98 list.add(-5); | |
| 99 list.add(100); | |
| 100 list.add(9); | |
| 101 Collections.sort(list, (Integer i1, Integer i2)-> i2 - i1); | |
| 102 String result = ""; | |
| 103 for(int i : list) | |
| 104 result += i + " "; | |
| 105 assertTrue(result.equals("100 10 9 4 -5 ")); | |
| 106 | |
| 107 Collections.sort(list, | |
| 108 (i1, i2) -> { | |
| 109 String s1 = i1.toString(); | |
| 110 String s2 = i2.toString(); | |
| 111 return s1.length() - s2.length(); | |
| 112 }); | |
| 113 result = ""; | |
| 114 for(int i : list) | |
| 115 result += i + " "; | |
| 116 assertTrue(result.equals("9 4 10 -5 100 ")); | |
| 117 } | |
| 118 } |
