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
31 import java.util.ArrayList;
32 import java.util.Collections;
33 import java.util.LinkedList;
34 import java.util.List;
35
36 public class Frequency {
37 static final int N = 100;
38 public static void main(String[] args) {
39 test(new ArrayList<Integer>());
40 test(new LinkedList<Integer>());
41 }
42
43 static void test(List<Integer> list) {
44 for (int i = 0; i < N; i++)
45 for (int j = 0; j < i; j++)
46 list.add(i);
47 Collections.shuffle(list);
48
49 for (int i = 0; i < N; i++)
50 if (Collections.frequency(list, i) != i)
51 throw new RuntimeException(list.getClass() + ": " + i);
52 }
53 }
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1 /*
2 * Copyright (c) 2003, 2026, 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 * @library /test/lib
30 */
31
32 import jdk.test.lib.valueclass.VClass;
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;
40
41 public static void main(String[] args) {
42 test(new ArrayList<Integer>());
43 test(new LinkedList<Integer>());
44 testValue();
45 }
46
47 static void test(List<Integer> list) {
48 for (int i = 0; i < N; i++)
49 for (int j = 0; j < i; j++)
50 list.add(i);
51 Collections.shuffle(list);
52
53 for (int i = 0; i < N; i++)
54 if (Collections.frequency(list, i) != i)
55 throw new RuntimeException(list.getClass() + ": " + i);
56 }
57
58 static void testValue() {
59 List<VClass> values = new ArrayList<>();
60 for (int i = 0; i < N; i++)
61 for (int j = 0; j < i; j++)
62 values.add(new VClass(i, new int[] { i }));
63 Collections.shuffle(values);
64 for (int i = 0; i < N; i++)
65 if (Collections.frequency(values, new VClass(i, new int[] { i })) != i)
66 throw new RuntimeException("value frequency: " + i);
67 }
68 }
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