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 }