1 /*
   2  * Copyright (c) 2017, 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  * @test
  26  * @bug 8206986
  27  * @summary Verify that an switch expression over enum can be exhaustive without default.
  28  * @compile --enable-preview -source ${jdk.version} ExhaustiveEnumSwitch.java
  29  * @compile ExhaustiveEnumSwitchExtra.java
  30  * @run main/othervm --enable-preview ExhaustiveEnumSwitch
  31  */
  32 
  33 public class ExhaustiveEnumSwitch {
  34     public static void main(String... args) {
  35         new ExhaustiveEnumSwitch().run();
  36     }
  37 
  38     private void run() {
  39         ExhaustiveEnumSwitchEnum v = ExhaustiveEnumSwitchEnum.valueOf("F");
  40 
  41         try {
  42             print(v);
  43             throw new AssertionError("Expected exception did not occur.");
  44         } catch (IncompatibleClassChangeError err) {
  45             //ok
  46         }
  47     }
  48 
  49     private String print(ExhaustiveEnumSwitchEnum t) {
  50         return switch (t) {
  51             case A -> "A";
  52             case B -> "B";
  53         };
  54     }
  55 
  56 }
  57 enum ExhaustiveEnumSwitchEnum {
  58     A, B;
  59 }