util/Collections/ReverseOrder2.java

/*
 * Copyright (c) 2003, 2007, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @test
 * @bug     4809442 6366832 4974878 6372554 4890211 6483125
 * @summary Basic test for Collections.reverseOrder
 * @author  Josh Bloch, Martin Buchholz
 */

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedList;
import java.util.List;

public class ReverseOrder2 {
    static final int N = 100;

    static void realMain(String[] args) throws Throwable {
        check(Collections.reverseOrder()
              == Collections.reverseOrder(null));

        check(Collections.reverseOrder()
              == reincarnate(Collections.reverseOrder()));

        check(Collections.reverseOrder(Collections.reverseOrder(cmp))
              == cmp);

        equal(Collections.reverseOrder(cmp),
              Collections.reverseOrder(cmp));

        equal(Collections.reverseOrder(cmp).hashCode(),
              Collections.reverseOrder(cmp).hashCode());

        check(Collections.reverseOrder(cmp).hashCode() !=
              cmp.hashCode());

        test(new ArrayList<String>());
        test(new LinkedList<String>());
        test2(new ArrayList<Integer>());
        test2(new LinkedList<Integer>());
    }

    static void test(List<String> list) {
        for (int i = 0; i < N; i++)
            list.add(String.valueOf(i));
        Collections.shuffle(list);
        Collections.sort(list, Collections.reverseOrder(cmp));
        equal(list, golden);
    }

    private static Comparator<String> cmp = new Comparator<>() {
        public int compare(String s1, String s2) {
            int i1 = Integer.parseInt(s1);
            int i2 = Integer.parseInt(s2);
            return (i1 < i2 ? Integer.MIN_VALUE : (i1 == i2 ? 0 : 1));
        }
    };

    private static final List<String> golden = new ArrayList<>(N);
    static {
        for (int i = N-1; i >= 0; i--)
            golden.add(String.valueOf(i));
    }

    static void test2(List<Integer> list) {
        for (int i = 0; i < N; i++)
            list.add(i);
        Collections.shuffle(list);
        Collections.sort(list, Collections.reverseOrder(null));
        equal(list, golden2);
    }

    private static final List<Integer> golden2 = new ArrayList<>(N);
    static {
        for (int i = N-1; i >= 0; i--)
            golden2.add(i);
    }

    //--------------------- Infrastructure ---------------------------
    static volatile int passed = 0, failed = 0;
    static void pass() {passed++;}
    static void fail() {failed++; Thread.dumpStack();}
    static void fail(String msg) {System.out.println(msg); fail();}
    static void unexpected(Throwable t) {failed++; t.printStackTrace();}
    static void check(boolean cond) {if (cond) pass(); else fail();}
    static void equal(Object x, Object y) {
        if (x == null ? y == null : x.equals(y)) pass();
        else fail(x + " not equal to " + y);}
    public static void main(String[] args) throws Throwable {
        try {realMain(args);} catch (Throwable t) {unexpected(t);}
        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
        if (failed > 0) throw new AssertionError("Some tests failed");}
    static byte[] serializedForm(Object obj) {
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            new ObjectOutputStream(baos).writeObject(obj);
            return baos.toByteArray();
        } catch (IOException e) {throw new RuntimeException(e);}}
    static Object readObject(byte[] bytes)
        throws IOException, ClassNotFoundException {
        InputStream is = new ByteArrayInputStream(bytes);
        return new ObjectInputStream(is).readObject();}
    @SuppressWarnings("unchecked")
    static <T> T reincarnate(T obj) {
        try {return (T) readObject(serializedForm(obj));}
        catch (Exception e) {throw new RuntimeException(e);}}
}
Revision:	1.5
Committed:	Mon Jan 8 03:12:03 2018 UTC (6 years, 4 months ago) by jsr166
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.4:	+11 -2 lines
Log Message:	organize imports
#	User	Rev	Content
1	jsr166	1.1	/*
2	jsr166	1.2	* Copyright (c) 2003, 2007, Oracle and/or its affiliates. All rights reserved.
3	jsr166	1.1	* 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	jsr166	1.2	* 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	jsr166	1.1	*/
23
24			/*
25			* @test
26			* @bug 4809442 6366832 4974878 6372554 4890211 6483125
27			* @summary Basic test for Collections.reverseOrder
28			* @author Josh Bloch, Martin Buchholz
29			*/
30
31	jsr166	1.5	import java.io.ByteArrayInputStream;
32			import java.io.ByteArrayOutputStream;
33			import java.io.IOException;
34			import java.io.InputStream;
35			import java.io.ObjectInputStream;
36			import java.io.ObjectOutputStream;
37			import java.util.ArrayList;
38			import java.util.Collections;
39			import java.util.Comparator;
40			import java.util.LinkedList;
41			import java.util.List;
42	jsr166	1.1
43			public class ReverseOrder2 {
44	jsr166	1.3	static final int N = 100;
45	jsr166	1.1
46			static void realMain(String[] args) throws Throwable {
47			check(Collections.reverseOrder()
48			== Collections.reverseOrder(null));
49
50			check(Collections.reverseOrder()
51			== reincarnate(Collections.reverseOrder()));
52
53			check(Collections.reverseOrder(Collections.reverseOrder(cmp))
54			== cmp);
55
56			equal(Collections.reverseOrder(cmp),
57			Collections.reverseOrder(cmp));
58
59			equal(Collections.reverseOrder(cmp).hashCode(),
60			Collections.reverseOrder(cmp).hashCode());
61
62			check(Collections.reverseOrder(cmp).hashCode() !=
63			cmp.hashCode());
64
65			test(new ArrayList<String>());
66			test(new LinkedList<String>());
67			test2(new ArrayList<Integer>());
68			test2(new LinkedList<Integer>());
69			}
70
71			static void test(List<String> list) {
72			for (int i = 0; i < N; i++)
73			list.add(String.valueOf(i));
74			Collections.shuffle(list);
75			Collections.sort(list, Collections.reverseOrder(cmp));
76			equal(list, golden);
77			}
78
79	jsr166	1.4	private static Comparator<String> cmp = new Comparator<>() {
80	jsr166	1.1	public int compare(String s1, String s2) {
81			int i1 = Integer.parseInt(s1);
82			int i2 = Integer.parseInt(s2);
83			return (i1 < i2 ? Integer.MIN_VALUE : (i1 == i2 ? 0 : 1));
84			}
85			};
86
87	jsr166	1.4	private static final List<String> golden = new ArrayList<>(N);
88	jsr166	1.1	static {
89			for (int i = N-1; i >= 0; i--)
90			golden.add(String.valueOf(i));
91			}
92
93			static void test2(List<Integer> list) {
94			for (int i = 0; i < N; i++)
95			list.add(i);
96			Collections.shuffle(list);
97			Collections.sort(list, Collections.reverseOrder(null));
98			equal(list, golden2);
99			}
100
101	jsr166	1.4	private static final List<Integer> golden2 = new ArrayList<>(N);
102	jsr166	1.1	static {
103			for (int i = N-1; i >= 0; i--)
104			golden2.add(i);
105			}
106
107			//--------------------- Infrastructure ---------------------------
108			static volatile int passed = 0, failed = 0;
109			static void pass() {passed++;}
110			static void fail() {failed++; Thread.dumpStack();}
111			static void fail(String msg) {System.out.println(msg); fail();}
112			static void unexpected(Throwable t) {failed++; t.printStackTrace();}
113			static void check(boolean cond) {if (cond) pass(); else fail();}
114			static void equal(Object x, Object y) {
115			if (x == null ? y == null : x.equals(y)) pass();
116			else fail(x + " not equal to " + y);}
117			public static void main(String[] args) throws Throwable {
118			try {realMain(args);} catch (Throwable t) {unexpected(t);}
119			System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
120			if (failed > 0) throw new AssertionError("Some tests failed");}
121			static byte[] serializedForm(Object obj) {
122			try {
123			ByteArrayOutputStream baos = new ByteArrayOutputStream();
124			new ObjectOutputStream(baos).writeObject(obj);
125			return baos.toByteArray();
126			} catch (IOException e) {throw new RuntimeException(e);}}
127			static Object readObject(byte[] bytes)
128			throws IOException, ClassNotFoundException {
129			InputStream is = new ByteArrayInputStream(bytes);
130			return new ObjectInputStream(is).readObject();}
131			@SuppressWarnings("unchecked")
132			static <T> T reincarnate(T obj) {
133			try {return (T) readObject(serializedForm(obj));}
134			catch (Exception e) {throw new RuntimeException(e);}}
135			}