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 }