| /* |
| * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * @test |
| * @bug 8003280 |
| * @summary Add lambda tests |
| * Test lambda expressions for existing SAM interfaces like Runnable and Comparator<T> |
| * @compile LambdaTest1.java |
| * @run main LambdaTest1 |
| */ |
| |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.ArrayList; |
| |
| public class LambdaTest1 { |
| |
| private static String assertionStr = ""; |
| |
| private static void assertTrue(boolean b) { |
| if(!b) |
| throw new AssertionError(); |
| } |
| |
| private static void test1(Runnable r) { |
| r.run(); |
| } |
| |
| void test2(Object o) { |
| if(o instanceof Runnable) |
| ((Runnable)o).run(); |
| } |
| |
| Runnable test3() { |
| return ()-> { assertionStr += "Runnable6"; }; |
| } |
| |
| public static void main(String[] args) { |
| |
| //lambda expressions for SAM interface Runnable: |
| //assign: |
| Runnable r = ()-> { assertionStr += "Runnable1 "; }; |
| r.run(); |
| |
| //cast: |
| ((Runnable)()-> { assertionStr += "Runnable2 "; }).run(); |
| |
| Object o = (Runnable)()-> {}; |
| |
| o = (Runnable)()-> { |
| switch (assertionStr) { |
| case "Runnable1 Runnable2 ": |
| assertionStr += "Runnable3 "; |
| break; |
| default: |
| throw new AssertionError(); |
| } |
| return; |
| }; |
| |
| //method parameter: |
| test1(()-> { assertionStr += "Runnable4 "; return; }); |
| |
| LambdaTest1 test = new LambdaTest1(); |
| test.test2((Runnable)()-> { assertionStr += "Runnable5 "; }); |
| |
| //return type: |
| r = test.test3(); |
| r.run(); |
| |
| assertTrue(assertionStr.equals("Runnable1 Runnable2 Runnable4 Runnable5 Runnable6")); |
| |
| //lambda expressions for SAM interface Comparator<T>: |
| List<Integer> list = new ArrayList<Integer>(); |
| list.add(4); |
| list.add(10); |
| list.add(-5); |
| list.add(100); |
| list.add(9); |
| Collections.sort(list, (Integer i1, Integer i2)-> i2 - i1); |
| String result = ""; |
| for(int i : list) |
| result += i + " "; |
| assertTrue(result.equals("100 10 9 4 -5 ")); |
| |
| Collections.sort(list, |
| (i1, i2) -> { |
| String s1 = i1.toString(); |
| String s2 = i2.toString(); |
| return s1.length() - s2.length(); |
| }); |
| result = ""; |
| for(int i : list) |
| result += i + " "; |
| assertTrue(result.equals("9 4 10 -5 100 ")); |
| } |
| } |