102 lines
3.2 KiB
Java
102 lines
3.2 KiB
Java
/*
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* Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 4593209 8001667
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* @summary Reverse comparator was subtly broken
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* @author Josh Bloch
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*/
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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public class ReverseOrder {
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static byte[] serialBytes(Object o) {
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try {
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ByteArrayOutputStream bos = new ByteArrayOutputStream();
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ObjectOutputStream oos = new ObjectOutputStream(bos);
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oos.writeObject(o);
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oos.flush();
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oos.close();
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return bos.toByteArray();
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} catch (Throwable t) {
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throw new Error(t);
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}
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}
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@SuppressWarnings("unchecked")
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static <T> T serialClone(T o) {
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try {
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ObjectInputStream ois = new ObjectInputStream
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(new ByteArrayInputStream(serialBytes(o)));
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T clone = (T) ois.readObject();
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return clone;
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} catch (Throwable t) {
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throw new Error(t);
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}
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}
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public static void main(String[] args) throws Exception {
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Foo[] a = { new Foo(2), new Foo(3), new Foo(1) };
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List list = Arrays.asList(a);
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Comparator cmp = Collections.reverseOrder();
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Collections.sort(list, cmp);
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Foo[] golden = { new Foo(3), new Foo(2), new Foo(1) };
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List goldenList = Arrays.asList(golden);
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if (!list.equals(goldenList))
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throw new Exception(list.toString());
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Comparator clone = serialClone(cmp);
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List list2 = Arrays.asList(a);
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Collections.sort(list2, clone);
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if (!list2.equals(goldenList))
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throw new Exception(list.toString());
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}
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}
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class Foo implements Comparable {
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int val;
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Foo(int i) { val = i; }
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public int compareTo(Object o) {
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Foo f = (Foo)o;
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return (val < f.val ? Integer.MIN_VALUE : (val == f.val ? 0 : 1));
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}
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public boolean equals(Object o) {
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return o instanceof Foo && ((Foo)o).val == val;
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}
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public int hashCode() { return val; }
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public String toString() { return Integer.toString(val); }
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}
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