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