1 /*
   2  * Copyright (c) 2002, 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 4593209
  27  * @summary Reverse comparator was subtly broken
  28  * @author Josh bloch
  29  */
  30 
  31 import java.util.*;
  32 
  33 public class ReverseOrder {
  34     public static void main(String[] args) throws Exception {
  35         Foo[] a = { new Foo(2), new Foo(3), new Foo(1) };
  36         List list = Arrays.asList(a);
  37         Collections.sort(list, Collections.reverseOrder());
  38 
  39         Foo[] golden = { new Foo(3), new Foo(2), new Foo(1) };
  40         List goldenList = Arrays.asList(golden);
  41         if (!list.equals(goldenList))
  42             throw new Exception(list.toString());
  43     }
  44 }
  45 
  46 class Foo implements Comparable {
  47     int val;
  48     Foo(int i) { val = i; }
  49 
  50     public int compareTo(Object o) {
  51         Foo f = (Foo)o;
  52         return (val < f.val ? Integer.MIN_VALUE : (val == f.val ? 0 : 1));
  53     }
  54 
  55     public boolean equals(Object o) {
  56         return o instanceof Foo && ((Foo)o).val == val;
  57     }
  58 
  59     public int hashCode()    { return val; }
  60 
  61     public String toString() { return Integer.toString(val); }
  62 }