aoqi@0: /*
aoqi@0:  * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: /**
aoqi@0:  * @test
aoqi@0:  * @bug 8003280
aoqi@0:  * @summary Add lambda tests
aoqi@0:  *   Test lambda expressions for existing SAM interfaces like Runnable and Comparator<T>
aoqi@0:  * @compile LambdaTest1.java
aoqi@0:  * @run main LambdaTest1
aoqi@0:  */
aoqi@0: 
aoqi@0: import java.util.Collections;
aoqi@0: import java.util.List;
aoqi@0: import java.util.ArrayList;
aoqi@0: 
aoqi@0: public class LambdaTest1 {
aoqi@0: 
aoqi@0:     private static String assertionStr = "";
aoqi@0: 
aoqi@0:     private static void assertTrue(boolean b) {
aoqi@0:         if(!b)
aoqi@0:             throw new AssertionError();
aoqi@0:     }
aoqi@0: 
aoqi@0:     private static void test1(Runnable r) {
aoqi@0:         r.run();
aoqi@0:     }
aoqi@0: 
aoqi@0:     void test2(Object o) {
aoqi@0:         if(o instanceof Runnable)
aoqi@0:             ((Runnable)o).run();
aoqi@0:     }
aoqi@0: 
aoqi@0:     Runnable test3() {
aoqi@0:         return ()-> { assertionStr += "Runnable6"; };
aoqi@0:     }
aoqi@0: 
aoqi@0:     public static void main(String[] args) {
aoqi@0: 
aoqi@0:         //lambda expressions for SAM interface Runnable:
aoqi@0:         //assign:
aoqi@0:         Runnable r = ()-> { assertionStr += "Runnable1 "; };
aoqi@0:         r.run();
aoqi@0: 
aoqi@0:         //cast:
aoqi@0:         ((Runnable)()-> { assertionStr += "Runnable2 "; }).run();
aoqi@0: 
aoqi@0:         Object o = (Runnable)()-> {};
aoqi@0: 
aoqi@0:         o = (Runnable)()-> {
aoqi@0:                 switch (assertionStr) {
aoqi@0:                     case "Runnable1 Runnable2 ":
aoqi@0:                         assertionStr += "Runnable3 ";
aoqi@0:                         break;
aoqi@0:                     default:
aoqi@0:                         throw new AssertionError();
aoqi@0:                 }
aoqi@0:                 return;
aoqi@0:             };
aoqi@0: 
aoqi@0:         //method parameter:
aoqi@0:         test1(()-> { assertionStr += "Runnable4 "; return; });
aoqi@0: 
aoqi@0:         LambdaTest1 test = new LambdaTest1();
aoqi@0:         test.test2((Runnable)()-> { assertionStr += "Runnable5 "; });
aoqi@0: 
aoqi@0:         //return type:
aoqi@0:         r = test.test3();
aoqi@0:         r.run();
aoqi@0: 
aoqi@0:         assertTrue(assertionStr.equals("Runnable1 Runnable2 Runnable4 Runnable5 Runnable6"));
aoqi@0: 
aoqi@0:         //lambda expressions for SAM interface Comparator<T>:
aoqi@0:         List<Integer> list = new ArrayList<Integer>();
aoqi@0:         list.add(4);
aoqi@0:         list.add(10);
aoqi@0:         list.add(-5);
aoqi@0:         list.add(100);
aoqi@0:         list.add(9);
aoqi@0:         Collections.sort(list, (Integer i1, Integer i2)-> i2 - i1);
aoqi@0:         String result = "";
aoqi@0:         for(int i : list)
aoqi@0:             result += i + " ";
aoqi@0:         assertTrue(result.equals("100 10 9 4 -5 "));
aoqi@0: 
aoqi@0:         Collections.sort(list,
aoqi@0:             (i1, i2) -> {
aoqi@0:                 String s1 = i1.toString();
aoqi@0:                 String s2 = i2.toString();
aoqi@0:                 return s1.length() - s2.length();
aoqi@0:              });
aoqi@0:         result = "";
aoqi@0:         for(int i : list)
aoqi@0:             result += i + " ";
aoqi@0:         assertTrue(result.equals("9 4 10 -5 100 "));
aoqi@0:     }
aoqi@0: }