1 /* 2 * Copyright (c) 2018, 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 * @test 26 * @bug 8206986 27 * @compile --enable-preview -source 12 ExpressionSwitchCodeFromJLS.java 28 * @run main/othervm --enable-preview ExpressionSwitchCodeFromJLS 29 */ 30 31 public class ExpressionSwitchCodeFromJLS { 32 static void howMany(int k) { 33 switch (k) { 34 case 1: System.out.print("one "); 35 case 2: System.out.print("too "); 36 case 3: System.out.println("many"); 37 } 38 } 39 static void howManyRule(int k) { 40 switch (k) { 41 case 1 -> System.out.println("one"); 42 case 2 -> System.out.println("two"); 43 case 3 -> System.out.println("many"); 44 } 45 } 46 static void howManyGroup(int k) { 47 switch (k) { 48 case 1: System.out.println("one"); 49 break; // exit the switch 50 case 2: System.out.println("two"); 51 break; // exit the switch 52 case 3: System.out.println("many"); 53 break; // not needed, but good style 54 } 55 } 56 public static void main(String[] args) { 57 howMany(3); 58 howMany(2); 59 howMany(1); 60 howManyRule(1); 61 howManyRule(2); 62 howManyRule(3); 63 howManyGroup(1); 64 howManyGroup(2); 65 howManyGroup(3); 66 } 67 }