Frequency.java revision 12745:f068a4ffddd2 
1/*
2 * Copyright (c) 2003, 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     4193200
27 * @summary Basic test for Collections.frequency
28 * @author  Josh Bloch
29 */
30
31import java.util.*;
32
33public class Frequency {
34    static final int N = 100;
35    public static void main(String args[]) {
36        test(new ArrayList<Integer>());
37        test(new LinkedList<Integer>());
38    }
39
40    static void test(List<Integer> list) {
41        for (int i = 0; i < N; i++)
42            for (int j = 0; j < i; j++)
43                list.add(i);
44        Collections.shuffle(list);
45
46        for (int i = 0; i < N; i++)
47            if (Collections.frequency(list, i) != i)
48                throw new RuntimeException(list.getClass() + ": " + i);
49    }
50}
51