1 /* 2 * Copyright (c) 2020, 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 import java.util.Arrays; 26 import java.util.List; 27 import java.util.function.Predicate; 28 29 public class PredicateApp { 30 public static void main(String[] args){ 31 boolean isRuntime = (args.length == 1 && args[0].equals("run")) ? true : false; 32 List languages = Arrays.asList("Java", "Scala", "C++", "Haskell", "Lisp"); 33 34 doit(() -> { 35 System.out.println("Languages which starts with J :"); 36 filter(languages, (str)->((String)str).startsWith("J")); 37 LambdaVerification.verifyCallerIsArchivedLambda(isRuntime); 38 }); 39 40 doit(() -> { 41 System.out.println("Languages which ends with a "); 42 filter(languages, (str)->((String)str).endsWith("a")); 43 LambdaVerification.verifyCallerIsArchivedLambda(isRuntime); 44 }); 45 46 doit(() -> { 47 System.out.println("Print all languages :"); 48 filter(languages, (str)->true); 49 LambdaVerification.verifyCallerIsArchivedLambda(isRuntime); 50 }); 51 52 doit(() -> { 53 System.out.println("Print no language : "); 54 filter(languages, (str)->false); 55 LambdaVerification.verifyCallerIsArchivedLambda(isRuntime); 56 }); 57 58 doit(() -> { 59 System.out.println("Print language whose length greater than 4:"); 60 filter(languages, (str)->((String)str).length() > 4); 61 LambdaVerification.verifyCallerIsArchivedLambda(isRuntime); 62 }); 63 } 64 65 public static void filter(List names, Predicate condition) { 66 names.stream().filter((name) -> (condition.test(name))).forEach((name) -> { 67 System.out.println(name + " "); 68 }); 69 } 70 71 static void doit(Runnable t) { 72 t.run(); 73 } 74 }