jdk/test/java/util/Collections/Disjoint.java
author duke
Sat, 01 Dec 2007 00:00:00 +0000
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/*
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 * Copyright 2003 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 */
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/*
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 * @test
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 * @bug     4339792
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 * @summary Basic test for Collections.disjoint
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 * @author  Josh Bloch
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 *
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 * @compile -source 1.5 Disjoint.java
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 * @run main Disjoint
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 */
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import java.util.*;
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public class Disjoint {
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    final static int N = 20;
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    public static void main(String args[]) {
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        // Make an array of lists each of which shares a single element
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        // with its "neighbors," and no elements with other lists in the array
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        Random rnd = new Random();
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        List[] lists = new List[N];
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        int x = 0;
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        for (int i = 0; i < N; i++) {
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            int size = rnd.nextInt(10) + 2;
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            List<Integer> list = new ArrayList<Integer>(size);
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            for (int j = 1; j < size; j++)
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                list.add(x++);
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            list.add(x);
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            Collections.shuffle(list);
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            lists[i] = list;
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        }
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        for (int i = 0; i < N; i++) {
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            for (int j = 0; j < N; j++) {
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                boolean disjoint = (Math.abs(i - j) > 1);
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                List<Integer> a = (List<Integer>) lists[i];
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                List<Integer> b = (List<Integer>) lists[j];
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                if (Collections.disjoint(a, b) != disjoint)
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                    throw new RuntimeException("A: " + i + ", " + j);
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                if (Collections.disjoint(new HashSet<Integer>(a), b)
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                    != disjoint)
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                    throw new RuntimeException("B: " + i + ", " + j);
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                if (Collections.disjoint(new HashSet<Integer>(a),
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                                         new HashSet<Integer>(b)) != disjoint)
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                    throw new RuntimeException("C: " + i + ", " + j);
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            }
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        }
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    }
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}