136 lines
5.0 KiB
Java
136 lines
5.0 KiB
Java
/*
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* Copyright (c) 2003, 2007, 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 4809442 6366832 4974878 6372554 4890211 6483125
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* @summary Basic test for Collections.reverseOrder
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* @author Josh Bloch, Martin Buchholz
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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.IOException;
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import java.io.InputStream;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.LinkedList;
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import java.util.List;
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public class ReverseOrder2 {
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static final int N = 100;
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static void realMain(String[] args) throws Throwable {
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check(Collections.reverseOrder()
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== Collections.reverseOrder(null));
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check(Collections.reverseOrder()
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== reincarnate(Collections.reverseOrder()));
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check(Collections.reverseOrder(Collections.reverseOrder(cmp))
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== cmp);
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equal(Collections.reverseOrder(cmp),
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Collections.reverseOrder(cmp));
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equal(Collections.reverseOrder(cmp).hashCode(),
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Collections.reverseOrder(cmp).hashCode());
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check(Collections.reverseOrder(cmp).hashCode() !=
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cmp.hashCode());
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test(new ArrayList<String>());
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test(new LinkedList<String>());
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test2(new ArrayList<Integer>());
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test2(new LinkedList<Integer>());
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}
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static void test(List<String> list) {
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for (int i = 0; i < N; i++)
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list.add(String.valueOf(i));
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Collections.shuffle(list);
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Collections.sort(list, Collections.reverseOrder(cmp));
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equal(list, golden);
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}
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private static Comparator<String> cmp = new Comparator<>() {
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public int compare(String s1, String s2) {
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int i1 = Integer.parseInt(s1);
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int i2 = Integer.parseInt(s2);
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return (i1 < i2 ? Integer.MIN_VALUE : (i1 == i2 ? 0 : 1));
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}
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};
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private static final List<String> golden = new ArrayList<>(N);
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static {
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for (int i = N-1; i >= 0; i--)
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golden.add(String.valueOf(i));
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}
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static void test2(List<Integer> list) {
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for (int i = 0; i < N; i++)
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list.add(i);
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Collections.shuffle(list);
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Collections.sort(list, Collections.reverseOrder(null));
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equal(list, golden2);
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}
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private static final List<Integer> golden2 = new ArrayList<>(N);
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static {
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for (int i = N-1; i >= 0; i--)
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golden2.add(i);
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}
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//--------------------- Infrastructure ---------------------------
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static volatile int passed = 0, failed = 0;
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static void pass() {passed++;}
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static void fail() {failed++; Thread.dumpStack();}
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static void fail(String msg) {System.out.println(msg); fail();}
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static void unexpected(Throwable t) {failed++; t.printStackTrace();}
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static void check(boolean cond) {if (cond) pass(); else fail();}
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static void equal(Object x, Object y) {
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if (x == null ? y == null : x.equals(y)) pass();
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else fail(x + " not equal to " + y);}
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public static void main(String[] args) throws Throwable {
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try {realMain(args);} catch (Throwable t) {unexpected(t);}
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System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
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if (failed > 0) throw new AssertionError("Some tests failed");}
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static byte[] serializedForm(Object obj) {
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try {
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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new ObjectOutputStream(baos).writeObject(obj);
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return baos.toByteArray();
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} catch (IOException e) {throw new RuntimeException(e);}}
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static Object readObject(byte[] bytes)
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throws IOException, ClassNotFoundException {
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InputStream is = new ByteArrayInputStream(bytes);
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return new ObjectInputStream(is).readObject();}
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@SuppressWarnings("unchecked")
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static <T> T reincarnate(T obj) {
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try {return (T) readObject(serializedForm(obj));}
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catch (Exception e) {throw new RuntimeException(e);}}
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}
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