1 /*
   2  * Copyright 2003 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug     4329937
  27  * @summary Basic test for making Boolean implement Comparable
  28  * @author  Josh Bloch
  29  *
  30  * @compile -source 1.5 MakeBooleanComparable.java
  31  * @run main MakeBooleanComparable
  32  */
  33 
  34 import java.util.*;
  35 
  36 public class MakeBooleanComparable {
  37     public static void main(String args[]) {
  38         Random rnd = new Random();
  39         List<Boolean> list = new ArrayList<Boolean>();
  40         int numFalse = 0;
  41         for (int i = 0; i < 1000; i++) {
  42             boolean element = rnd.nextBoolean();
  43             if (!element)
  44                 numFalse++;
  45             list.add(element); // Autoboxing!
  46         }
  47 
  48         Collections.sort(list);
  49 
  50         for (int i = 0; i < numFalse; i++)
  51             if (list.get(i).booleanValue())  // Autounboxing doesn't work yet!
  52                 throw new RuntimeException("False positive: " + i);
  53         for (int i = numFalse; i < 1000; i++)
  54             if (!list.get(i).booleanValue()) // Autounboxing doesn't work yet!
  55                 throw new RuntimeException("False negative: " + i);
  56     }
  57 }