1 /* 2 * Copyright (c) 2017, 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 * @summary Verify behavior of various kinds of breaks. 28 * @compile --enable-preview -source 13 ExpressionSwitchBreaks1.java 29 * @run main/othervm --enable-preview ExpressionSwitchBreaks1 30 */ 31 32 import java.util.Objects; 33 import java.util.function.Supplier; 34 35 public class ExpressionSwitchBreaks1 { 36 public static void main(String... args) { 37 new ExpressionSwitchBreaks1().run(); 38 } 39 40 private void run() { 41 check(print1(0, 0), "0-0"); 42 check(print1(0, 1), "0-1"); 43 check(print1(0, -1), "0-X"); 44 check(print1(-1, -1), "X"); 45 check(print2(0, 0, 0), "0-0-0"); 46 check(print2(0, 0, 1), "0-0-1"); 47 check(print2(0, 0, 2), "0-0-2"); 48 check(print2(0, 0, -1), "0-0-X"); 49 check(print2(0, 1, -1), "0-1"); 50 check(print2(0, -1, -1), "0-X"); 51 check(print2(1, -1, -1), "1"); 52 check(print2(2, 5, 5), "2-X-5"); 53 check(print2(-11, -1, -1), "X"); 54 } 55 56 private String print1(int i, int j) { 57 switch (i) { 58 case 0: 59 return switch (j) { 60 case 0: 61 if (true) break "0-0"; 62 case 1: 63 break "0-1"; 64 default: 65 break "0-X"; 66 }; 67 default: return "X"; 68 } 69 } 70 71 private String print2(int i, int j, int k) { 72 return switch (i) { 73 case 0: 74 String r; 75 OUTER: switch (j) { 76 case 0: 77 String res; 78 INNER: switch (k) { 79 case 0: res = "0-0-0"; break; 80 case 1: res = "0-0-1"; break; 81 case 2: res = "0-0-2"; break INNER; 82 default: r = "0-0-X"; break OUTER; 83 } 84 r = res; 85 break; 86 case 1: 87 r = "0-1"; 88 break; 89 default: 90 r = "0-X"; 91 break; 92 } 93 break r; 94 case 1: 95 break "1"; 96 case 2: 97 LOP: while (j-- > 0) { 98 if (k == 5) { 99 k--; 100 continue; 101 } 102 break LOP; 103 } 104 Supplier<String> getter = () -> { return "2-X-5"; }; 105 break getter.get(); 106 default: 107 break "X"; 108 }; 109 } 110 111 private void check(String result, String expected) { 112 if (!Objects.equals(result, expected)) { 113 throw new AssertionError("Unexpected result: " + result); 114 } 115 } 116 117 enum T { 118 A, B; 119 } 120 }