AddAll.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     4822887
27 * @summary Basic test for Collections.addAll
28 * @author  Josh Bloch
29 * @key randomness
30 */
31
32import java.util.*;
33
34public class AddAll {
35    static final int N = 100;
36    public static void main(String args[]) {
37        test(new ArrayList<Integer>());
38        test(new LinkedList<Integer>());
39        test(new HashSet<Integer>());
40        test(new LinkedHashSet<Integer>());
41    }
42
43    private static Random rnd = new Random();
44
45    static void test(Collection<Integer> c) {
46        int x = 0;
47        for (int i = 0; i < N; i++) {
48            int rangeLen = rnd.nextInt(10);
49            if (Collections.addAll(c, range(x, x + rangeLen)) !=
50                (rangeLen != 0))
51                throw new RuntimeException("" + rangeLen);
52            x += rangeLen;
53        }
54        if (c instanceof List) {
55            if (!c.equals(Arrays.asList(range(0, x))))
56                throw new RuntimeException(x +": "+c);
57        } else {
58            if (!c.equals(new HashSet<Integer>(Arrays.asList(range(0, x)))))
59                throw new RuntimeException(x +": "+c);
60        }
61    }
62
63    private static Integer[] range(int from, int to) {
64        Integer[] result = new Integer[to - from];
65        for (int i = from, j=0; i < to; i++, j++)
66            result[j] = new Integer(i);
67        return result;
68    }
69}
70