| /* |
| * 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * @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); |
| } |
| } |