1 /*

     2  * Copyright (c) 2010, 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 6955504 6992121

    27  * @summary Test the StringBuilder.ensureCapacity() with negative minimumCapacity

    28  *    and append() method with negative length input argument.

    29  *    Also, test the StringBuffer class.

    30  */

    31 

    32 import java.util.ArrayList;

    33 import java.util.Vector;

    34 

    35 public class EnsureCapacity {

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

    37         testStringBuilder();

    38         testStringBuffer();

    39     }

    40 

    41     private static void checkCapacity(int before, int after) {

    42         if (before != after) {

    43             throw new RuntimeException("capacity is expected to be unchanged: " +

    44                 "before=" + before + " after=" + after);

    45         }

    46     }

    47 

    48     private static void testStringBuilder() {

    49         StringBuilder sb = new StringBuilder("abc");

    50         int cap = sb.capacity();

    51 

    52         // test if negative minimumCapacity

    53         sb.ensureCapacity(Integer.MIN_VALUE);

    54         checkCapacity(cap, sb.capacity());

    55 

    56         try {

    57             char[] str = {'a', 'b', 'c', 'd'};

    58             // test if negative length

    59             sb.append(str, 0, Integer.MIN_VALUE + 10);

    60             throw new RuntimeException("IndexOutOfBoundsException not thrown");

    61         } catch (IndexOutOfBoundsException ex) {

    62         }

    63     }

    64 

    65     private static void testStringBuffer() {

    66         StringBuffer sb = new StringBuffer("abc");

    67         int cap = sb.capacity();

    68 

    69         // test if negative minimumCapacity

    70         sb.ensureCapacity(Integer.MIN_VALUE);

    71         checkCapacity(cap, sb.capacity());

    72 

    73         try {

    74             char[] str = {'a', 'b', 'c', 'd'};

    75             // test if negative length

    76             sb.append(str, 0, Integer.MIN_VALUE + 10);

    77             throw new RuntimeException("IndexOutOfBoundsException not thrown");

    78         } catch (IndexOutOfBoundsException ex) {

    79         }

    80     }

    81 }