1 /*

     2  * Copyright 1997 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 4091185

    27  * @summary Repeatedly OR BitSets; No OutOfMemoryException should result

    28  */

    29 

    30 import java.util.*;

    31 

    32 /**

    33  * This is a simple test class that repeatedly ORs two

    34  * BitSets of unequal size together. Previously this

    35  * caused an exponential growth in the memory underlying

    36  * the BitSets quickly using all available memory

    37  */

    38 public class MemoryLeak {

    39 

    40    public static void main(String[] args) {

    41 

    42         //create 2 test bitsets

    43         BitSet setOne = new BitSet();

    44         BitSet setTwo = new BitSet();

    45 

    46         setOne.set(64);

    47         setTwo.set(129);

    48 

    49         //test for bug #4091185

    50         //exponential set growth causing memory depletion

    51         for (int i = 0; i < 50; i++) {

    52             setOne.or(setTwo);

    53             setTwo.or(setOne);

    54         }

    55     }

    56 }