Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * Copyright (c) 2012, 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

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 /**

  * @test

  * @bug 8003280

  * @summary Add lambda tests

  *   This test is for lambda expressions

  * @compile LambdaTest1.java

  * @run main LambdaTest1

  */

 import java.util.Collections;

 import java.util.List;

 import java.util.ArrayList;

 public class LambdaTest1 {

     public static void main(String[] args) {

         LambdaTest1 test = new LambdaTest1();

         test.method2((int n) -> { });

         test.method2((int n) -> { });

         test.method2((int n) -> { return; }); // ";" is mandatory here

         test.method2((int n) -> { System.out.println(n); }); // ";" is optional here

         test.method2(n -> { System.out.println(n); }); //warning, explict type required for n?

         test.method3(()-> { System.out.println("implementing VoidVoid.vvMethod()"); });

         test.method3(() -> {});

         test.method4(()-> 42);

         test.method4(()-> { return 42; });//";" is mandatory here

         test.method5((int n)-> n+1);

         test.method5((int n) -> 42);

         test.method5((int n) -> { return 42; });

         test.method5(

             (int n) -> { //"{" optional here

                 if(n > 0)

                     return n++;

                 else

                     return n--;

             }

         );

         Runnable r = ()-> { System.out.println("Runnable.run() method implemented"); };

         r.run();

         ((Runnable)()-> { System.out.println("Runnable.run() method implemented"); }).run();

     }

     void method2(VoidInt a) {

         System.out.println("method2()");

         final int N = 1;

         int n = 2; //effectively final variable

         System.out.println("method2() \"this\":" + this);

         ((Runnable)

             ()->{

                 System.out.println("inside lambda \"this\":" + this);

                 System.out.println("inside lambda accessing final variable N:" + N);

                 System.out.println("inside lambda accessing effectively final variable n:" + n);

             }

         ).run();

         //n++; //compile error if n is modified

         a.viMethod(2);

     }

     void method3(VoidVoid a) {

         System.out.println("method3()");

         a.vvMethod();

     }

     void method4(IntVoid a) {

         System.out.println("method4()");

         System.out.println(a.ivMethod());

     }

     void method5(IntInt a) {

         System.out.println("method5()");

         System.out.println(a.iiMethod(5));

     }

     //SAM type interfaces

     interface VoidInt {

         void viMethod(int n);

     }

     interface VoidVoid {

         void vvMethod();

     }

     interface IntVoid {

         int ivMethod();

     }

     interface IntInt {

         int iiMethod(int n);

     }

 }