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  * @summary Verify behavior when an intersection type is inferred for switch expression.
  28  * @compile --enable-preview -source 12 ExpressionSwitchIntersectionTypes.java
  29  * @run main/othervm --enable-preview ExpressionSwitchIntersectionTypes
  30  */
  31 
  32 public class ExpressionSwitchIntersectionTypes<X  extends java.io.Serializable & Runnable> {
  33 
  34     void test1(int i, X x) {
  35         Runnable r1 = switch (i) {
  36             default -> x;
  37         };
  38         r1.run();
  39     }
  40 
  41     void test2(int i, X x) {
  42         (switch (i) {
  43             default -> x;
  44         }).run();
  45     }
  46 
  47     public static void main(String[] args) {
  48         ExpressionSwitchIntersectionTypes t = new ExpressionSwitchIntersectionTypes();
  49         try {
  50             t.test1(0, "");
  51             throw new AssertionError("Expected exception didn't occur.");
  52         } catch (ClassCastException ex) {
  53             //good
  54         }
  55         try {
  56             t.test2(0, "");
  57             throw new AssertionError("Expected exception didn't occur.");
  58         } catch (ClassCastException ex) {
  59             //good
  60         }
  61     }
  62 
  63 }