1 /*
   2  * Copyright (c) 2000, 2004, 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 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 }