1 /* 2 * Copyright (c) 2019, 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 * 23 */ 24 25 @FunctionalInterface 26 interface MyInterface { 27 public String sayHello(); 28 } 29 30 class MyClass implements MyInterface { 31 public String sayHello() { 32 return "Hello"; 33 } 34 } 35 36 public class SimpleApp { 37 public static boolean useLambda; 38 39 public static void main(String args[]) { 40 useLambda = (args.length == 1 && args[0].equals("lambda")) ? true : false; 41 if (!useLambda) { 42 MyClass mc = new MyClass(); 43 System.out.println(mc.sayHello()); 44 } else { 45 MyInterface msg = () -> { 46 return "Hello"; 47 }; 48 System.out.println(msg.sayHello()); 49 } 50 } 51 }