Thu, 31 Aug 2017 15:17:03 +0800
merge
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. |
aoqi@0 | 8 | * |
aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 13 | * accompanied this code). |
aoqi@0 | 14 | * |
aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 18 | * |
aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 21 | * questions. |
aoqi@0 | 22 | */ |
aoqi@0 | 23 | |
aoqi@0 | 24 | /** |
aoqi@0 | 25 | * @test |
aoqi@0 | 26 | * @bug 8003280 |
aoqi@0 | 27 | * @summary Add lambda tests |
aoqi@0 | 28 | * Test lambda expressions for existing SAM interfaces like Runnable and Comparator<T> |
aoqi@0 | 29 | * @compile LambdaTest1.java |
aoqi@0 | 30 | * @run main LambdaTest1 |
aoqi@0 | 31 | */ |
aoqi@0 | 32 | |
aoqi@0 | 33 | import java.util.Collections; |
aoqi@0 | 34 | import java.util.List; |
aoqi@0 | 35 | import java.util.ArrayList; |
aoqi@0 | 36 | |
aoqi@0 | 37 | public class LambdaTest1 { |
aoqi@0 | 38 | |
aoqi@0 | 39 | private static String assertionStr = ""; |
aoqi@0 | 40 | |
aoqi@0 | 41 | private static void assertTrue(boolean b) { |
aoqi@0 | 42 | if(!b) |
aoqi@0 | 43 | throw new AssertionError(); |
aoqi@0 | 44 | } |
aoqi@0 | 45 | |
aoqi@0 | 46 | private static void test1(Runnable r) { |
aoqi@0 | 47 | r.run(); |
aoqi@0 | 48 | } |
aoqi@0 | 49 | |
aoqi@0 | 50 | void test2(Object o) { |
aoqi@0 | 51 | if(o instanceof Runnable) |
aoqi@0 | 52 | ((Runnable)o).run(); |
aoqi@0 | 53 | } |
aoqi@0 | 54 | |
aoqi@0 | 55 | Runnable test3() { |
aoqi@0 | 56 | return ()-> { assertionStr += "Runnable6"; }; |
aoqi@0 | 57 | } |
aoqi@0 | 58 | |
aoqi@0 | 59 | public static void main(String[] args) { |
aoqi@0 | 60 | |
aoqi@0 | 61 | //lambda expressions for SAM interface Runnable: |
aoqi@0 | 62 | //assign: |
aoqi@0 | 63 | Runnable r = ()-> { assertionStr += "Runnable1 "; }; |
aoqi@0 | 64 | r.run(); |
aoqi@0 | 65 | |
aoqi@0 | 66 | //cast: |
aoqi@0 | 67 | ((Runnable)()-> { assertionStr += "Runnable2 "; }).run(); |
aoqi@0 | 68 | |
aoqi@0 | 69 | Object o = (Runnable)()-> {}; |
aoqi@0 | 70 | |
aoqi@0 | 71 | o = (Runnable)()-> { |
aoqi@0 | 72 | switch (assertionStr) { |
aoqi@0 | 73 | case "Runnable1 Runnable2 ": |
aoqi@0 | 74 | assertionStr += "Runnable3 "; |
aoqi@0 | 75 | break; |
aoqi@0 | 76 | default: |
aoqi@0 | 77 | throw new AssertionError(); |
aoqi@0 | 78 | } |
aoqi@0 | 79 | return; |
aoqi@0 | 80 | }; |
aoqi@0 | 81 | |
aoqi@0 | 82 | //method parameter: |
aoqi@0 | 83 | test1(()-> { assertionStr += "Runnable4 "; return; }); |
aoqi@0 | 84 | |
aoqi@0 | 85 | LambdaTest1 test = new LambdaTest1(); |
aoqi@0 | 86 | test.test2((Runnable)()-> { assertionStr += "Runnable5 "; }); |
aoqi@0 | 87 | |
aoqi@0 | 88 | //return type: |
aoqi@0 | 89 | r = test.test3(); |
aoqi@0 | 90 | r.run(); |
aoqi@0 | 91 | |
aoqi@0 | 92 | assertTrue(assertionStr.equals("Runnable1 Runnable2 Runnable4 Runnable5 Runnable6")); |
aoqi@0 | 93 | |
aoqi@0 | 94 | //lambda expressions for SAM interface Comparator<T>: |
aoqi@0 | 95 | List<Integer> list = new ArrayList<Integer>(); |
aoqi@0 | 96 | list.add(4); |
aoqi@0 | 97 | list.add(10); |
aoqi@0 | 98 | list.add(-5); |
aoqi@0 | 99 | list.add(100); |
aoqi@0 | 100 | list.add(9); |
aoqi@0 | 101 | Collections.sort(list, (Integer i1, Integer i2)-> i2 - i1); |
aoqi@0 | 102 | String result = ""; |
aoqi@0 | 103 | for(int i : list) |
aoqi@0 | 104 | result += i + " "; |
aoqi@0 | 105 | assertTrue(result.equals("100 10 9 4 -5 ")); |
aoqi@0 | 106 | |
aoqi@0 | 107 | Collections.sort(list, |
aoqi@0 | 108 | (i1, i2) -> { |
aoqi@0 | 109 | String s1 = i1.toString(); |
aoqi@0 | 110 | String s2 = i2.toString(); |
aoqi@0 | 111 | return s1.length() - s2.length(); |
aoqi@0 | 112 | }); |
aoqi@0 | 113 | result = ""; |
aoqi@0 | 114 | for(int i : list) |
aoqi@0 | 115 | result += i + " "; |
aoqi@0 | 116 | assertTrue(result.equals("9 4 10 -5 100 ")); |
aoqi@0 | 117 | } |
aoqi@0 | 118 | } |