| 1 |
/* |
| 2 |
* Copyright (c) 2002, 2013, 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 8001667 |
| 27 |
* @summary Reverse comparator was subtly broken |
| 28 |
* @author Josh Bloch |
| 29 |
*/ |
| 30 |
|
| 31 |
import java.util.*; |
| 32 |
import java.io.*; |
| 33 |
|
| 34 |
public class ReverseOrder { |
| 35 |
static byte[] serialBytes(Object o) { |
| 36 |
try { |
| 37 |
ByteArrayOutputStream bos = new ByteArrayOutputStream(); |
| 38 |
ObjectOutputStream oos = new ObjectOutputStream(bos); |
| 39 |
oos.writeObject(o); |
| 40 |
oos.flush(); |
| 41 |
oos.close(); |
| 42 |
return bos.toByteArray(); |
| 43 |
} catch (Throwable t) { |
| 44 |
throw new Error(t); |
| 45 |
} |
| 46 |
} |
| 47 |
|
| 48 |
@SuppressWarnings("unchecked") |
| 49 |
static <T> T serialClone(T o) { |
| 50 |
try { |
| 51 |
ObjectInputStream ois = new ObjectInputStream |
| 52 |
(new ByteArrayInputStream(serialBytes(o))); |
| 53 |
T clone = (T) ois.readObject(); |
| 54 |
return clone; |
| 55 |
} catch (Throwable t) { |
| 56 |
throw new Error(t); |
| 57 |
} |
| 58 |
} |
| 59 |
|
| 60 |
public static void main(String[] args) throws Exception { |
| 61 |
Foo[] a = { new Foo(2), new Foo(3), new Foo(1) }; |
| 62 |
List list = Arrays.asList(a); |
| 63 |
Comparator cmp = Collections.reverseOrder(); |
| 64 |
Collections.sort(list, cmp); |
| 65 |
|
| 66 |
Foo[] golden = { new Foo(3), new Foo(2), new Foo(1) }; |
| 67 |
List goldenList = Arrays.asList(golden); |
| 68 |
if (!list.equals(goldenList)) |
| 69 |
throw new Exception(list.toString()); |
| 70 |
|
| 71 |
Comparator clone = serialClone(cmp); |
| 72 |
List list2 = Arrays.asList(a); |
| 73 |
Collections.sort(list2, clone); |
| 74 |
if (!list2.equals(goldenList)) |
| 75 |
throw new Exception(list.toString()); |
| 76 |
} |
| 77 |
} |
| 78 |
|
| 79 |
class Foo implements Comparable { |
| 80 |
int val; |
| 81 |
Foo(int i) { val = i; } |
| 82 |
|
| 83 |
public int compareTo(Object o) { |
| 84 |
Foo f = (Foo)o; |
| 85 |
return (val < f.val ? Integer.MIN_VALUE : (val == f.val ? 0 : 1)); |
| 86 |
} |
| 87 |
|
| 88 |
public boolean equals(Object o) { |
| 89 |
return o instanceof Foo && ((Foo)o).val == val; |
| 90 |
} |
| 91 |
|
| 92 |
public int hashCode() { return val; } |
| 93 |
|
| 94 |
public String toString() { return Integer.toString(val); } |
| 95 |
} |
