jdk8-mips64-public/langtools: test/tools/javac/lambda/lambdaExpression/LambdaTest1.java@2eb010b6cb22

     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  */

    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  */

    33 import java.util.Collections;

    34 import java.util.List;

    35 import java.util.ArrayList;

    37 public class LambdaTest1 {

    39     private static String assertionStr = "";

    41     private static void assertTrue(boolean b) {

    42         if(!b)

    43             throw new AssertionError();

    44     }

    46     private static void test1(Runnable r) {

    47         r.run();

    48     }

    50     void test2(Object o) {

    51         if(o instanceof Runnable)

    52             ((Runnable)o).run();

    53     }

    55     Runnable test3() {

    56         return ()-> { assertionStr += "Runnable6"; };

    57     }

    59     public static void main(String[] args) {

    61         //lambda expressions for SAM interface Runnable:

    62         //assign:

    63         Runnable r = ()-> { assertionStr += "Runnable1 "; };

    64         r.run();

    66         //cast:

    67         ((Runnable)()-> { assertionStr += "Runnable2 "; }).run();

    69         Object o = (Runnable)()-> {};

    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             };

    82         //method parameter:

    83         test1(()-> { assertionStr += "Runnable4 "; return; });

    85         LambdaTest1 test = new LambdaTest1();

    86         test.test2((Runnable)()-> { assertionStr += "Runnable5 "; });

    88         //return type:

    89         r = test.test3();

    90         r.run();

    92         assertTrue(assertionStr.equals("Runnable1 Runnable2 Runnable4 Runnable5 Runnable6"));

    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 "));

   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 }

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