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 8214529
  27  * @summary Verify various corner cases with nested switch expressions.
  28  * @compile --enable-preview -source 13 ExpressionSwitchBugs.java
  29  * @run main/othervm --enable-preview ExpressionSwitchBugs
  30  */
  31 
  32 public class ExpressionSwitchBugs {
  33     public static void main(String... args) {
  34         new ExpressionSwitchBugs().testNested();
  35         new ExpressionSwitchBugs().testAnonymousClasses();
  36     }
  37 
  38     private void testNested() {
  39         int i = 0;
  40         check(42, id(switch (42) {
  41             default: i++; break 42;
  42         }));
  43         i = 0;
  44         check(43, id(switch (42) {
  45             case 42: while (i == 0) {
  46                 i++;
  47             }
  48             break 42 + i;
  49             default: i++; break 42;
  50         }));
  51         i = 0;
  52         check(42, id(switch (42) {
  53             case 42: if (i == 0) {
  54                 break 42;
  55             }
  56             default: i++; break 43;
  57         }));
  58         i = 0;
  59         check(42, id(switch (42) {
  60             case 42: if (i == 0) {
  61                 break 41 + switch (0) {
  62                     case 0 -> 1;
  63                     default -> -1;
  64                 };
  65             }
  66             default: i++; break 43;
  67         }));
  68     }
  69 
  70     private void testAnonymousClasses() {
  71         for (int i : new int[] {1, 2}) {
  72             check(3, id((switch (i) {
  73                 case 1: break new I() {
  74                     public int g() { return 3; }
  75                 };
  76                 default: break (I) () -> { return 3; };
  77             }).g()));
  78             check(3, id((switch (i) {
  79                 case 1 -> new I() {
  80                     public int g() { return 3; }
  81                 };
  82                 default -> (I) () -> { return 3; };
  83             }).g()));
  84         }
  85     }
  86 
  87     private int id(int i) {
  88         return i;
  89     }
  90 
  91     private int id(Object o) {
  92         return -1;
  93     }
  94 
  95     private void check(int actual, int expected) {
  96         if (actual != expected) {
  97             throw new AssertionError("Unexpected result: " + actual);
  98         }
  99     }
 100 
 101     public interface I {
 102         public int g();
 103     }
 104 }