1   /*
2    * Copyright (c) 2003, 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     4329937
27   * @summary Basic test for making Boolean implement Comparable
28   * @author  Josh Bloch
29   */
30  
31  import java.util.*;
32  
33  public class MakeBooleanComparable {
34      public static void main(String args[]) {
35          Random rnd = new Random();
36          List<Boolean> list = new ArrayList<Boolean>();
37          int numFalse = 0;
38          for (int i = 0; i < 1000; i++) {
39              boolean element = rnd.nextBoolean();
40              if (!element)
41                  numFalse++;
42              list.add(element); // Autoboxing!
43          }
44  
45          Collections.sort(list);
46  
47          for (int i = 0; i < numFalse; i++)
48              if (list.get(i).booleanValue())  // Autounboxing doesn't work yet!
49                  throw new RuntimeException("False positive: " + i);
50          for (int i = numFalse; i < 1000; i++)
51              if (!list.get(i).booleanValue()) // Autounboxing doesn't work yet!
52                  throw new RuntimeException("False negative: " + i);
53      }
54  }