1 /*

     2  * Copyright 2000-2004 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 4242309 4982981

    27  * @summary Test equals and contentEquals in String

    28  */

    29 import java.util.Random;

    30 import java.nio.CharBuffer;

    31 

    32 // Yes, I used cut and paste for this test. Yes more code

    33 // sharing could have been accomplished.

    34 public class ContentEquals {

    35 

    36     private static Random rnd = new Random();

    37     private static final int ITERATIONS = 1000;

    38     private static final int STR_LEN = 20;

    39 

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

    41         testStringBuffer();

    42         testStringBuilder();

    43         testString();

    44         testCharSequence();

    45     }

    46 

    47     // Test a StringBuffer, which uses the old method from 1.4

    48     public static void testStringBuffer() throws Exception {

    49         for (int i=0; i<ITERATIONS; i++) {

    50             int length = rnd.nextInt(STR_LEN) + 1;

    51             StringBuffer testStringBuffer = new StringBuffer();

    52             for(int x=0; x<length; x++) {

    53                 char aChar = (char)rnd.nextInt();

    54                 testStringBuffer.append(aChar);

    55             }

    56             String testString = testStringBuffer.toString();

    57             char c = testStringBuffer.charAt(0);

    58             testStringBuffer.setCharAt(0, 'c');

    59             testStringBuffer.setCharAt(0, c);

    60             if (!testString.contentEquals(testStringBuffer))

    61                 throw new RuntimeException("ContentsEqual failure");

    62         }

    63     }

    64 

    65     // Test StringBuilder as a CharSequence using new method in 1.5

    66     public static void testStringBuilder() throws Exception {

    67         for (int i=0; i<ITERATIONS; i++) {

    68             int length = rnd.nextInt(STR_LEN) + 1;

    69             StringBuilder testStringBuilder = new StringBuilder();

    70             for(int x=0; x<length; x++) {

    71                 char aChar = (char)rnd.nextInt();

    72                 testStringBuilder.append(aChar);

    73             }

    74             String testString = testStringBuilder.toString();

    75             char c = testStringBuilder.charAt(0);

    76             testStringBuilder.setCharAt(0, 'c');

    77             testStringBuilder.setCharAt(0, c);

    78             if (!testString.contentEquals(testStringBuilder))

    79                 throw new RuntimeException("ContentsEqual failure");

    80         }

    81     }

    82 

    83     // Test a String as a CharSequence. This takes a different codepath in

    84     // the new method in 1.5

    85     public static void testString() throws Exception {

    86         for (int i=0; i<ITERATIONS; i++) {

    87             int length = rnd.nextInt(STR_LEN) + 1;

    88             StringBuilder testStringBuilder = new StringBuilder();

    89             for(int x=0; x<length; x++) {

    90                 char aChar = (char)rnd.nextInt();

    91                 testStringBuilder.append(aChar);

    92             }

    93             String testString = testStringBuilder.toString();

    94             char c = testStringBuilder.charAt(0);

    95             testStringBuilder.setCharAt(0, 'c');

    96             testStringBuilder.setCharAt(0, c);

    97             if (!testString.contentEquals(testStringBuilder.toString()))

    98                 throw new RuntimeException("ContentsEqual failure");

    99         }

   100     }

   101 

   102     // Test a CharSequence that is not an AbstractStringBuilder,

   103     // this takes a different codepath in the new method in 1.5

   104     public static void testCharSequence() throws Exception {

   105         for (int i=0; i<ITERATIONS; i++) {

   106             int length = rnd.nextInt(STR_LEN) + 1;

   107             StringBuilder testStringBuilder = new StringBuilder();

   108             for(int x=0; x<length; x++) {

   109                 char aChar = (char)rnd.nextInt();

   110                 testStringBuilder.append(aChar);

   111             }

   112             String testString = testStringBuilder.toString();

   113             char c = testStringBuilder.charAt(0);

   114             testStringBuilder.setCharAt(0, 'c');

   115             testStringBuilder.setCharAt(0, c);

   116             CharBuffer buf = CharBuffer.wrap(testStringBuilder.toString());

   117             if (!testString.contentEquals(buf))

   118                 throw new RuntimeException("ContentsEqual failure");

   119         }

   120     }

   121 }