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
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22  */
23 
24 /*
25  * @test
26  * @bug     4193200
27  * @summary Basic test for Collections.frequency
28  * @author  Josh Bloch
29  */
30 
31 package test.java.util.Collections;
32 
33 import java.util.ArrayList;
34 import java.util.Collections;
35 import java.util.LinkedList;
36 import java.util.List;
37 
38 public class Frequency {
39     static final int N = 100;
main(String[] args)40     public static void main(String[] args) {
41         test(new ArrayList<Integer>());
42         test(new LinkedList<Integer>());
43     }
44 
test(List<Integer> list)45     static void test(List<Integer> list) {
46         for (int i = 0; i < N; i++)
47             for (int j = 0; j < i; j++)
48                 list.add(i);
49         Collections.shuffle(list);
50 
51         for (int i = 0; i < N; i++)
52             if (Collections.frequency(list, i) != i)
53                 throw new RuntimeException(list.getClass() + ": " + i);
54     }
55 }
56