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 * @key randomness 29 */ 30 import java.util.Random; 31 import java.nio.CharBuffer; 32 33 // Yes, I used cut and paste for this test. Yes more code 34 // sharing could have been accomplished. 35 public class ContentEquals { 36 37 private static Random rnd = new Random(); 38 private static final int ITERATIONS = 1000; 39 private static final int STR_LEN = 20; 40 41 public static void main(String[] args) throws Exception { 42 testStringBuffer(); 43 testStringBuilder(); 44 testString(); 45 testCharSequence(); 46 } 47 48 // Test a StringBuffer, which uses the old method from 1.4 49 public static void testStringBuffer() throws Exception { 50 for (int i=0; i<ITERATIONS; i++) { 51 int length = rnd.nextInt(STR_LEN) + 1; 52 StringBuffer testStringBuffer = new StringBuffer(); 53 for(int x=0; x<length; x++) { 54 char aChar = (char)rnd.nextInt(); 55 testStringBuffer.append(aChar); 56 } 57 String testString = testStringBuffer.toString(); 58 char c = testStringBuffer.charAt(0); 59 testStringBuffer.setCharAt(0, 'c'); 60 testStringBuffer.setCharAt(0, c); 61 if (!testString.contentEquals(testStringBuffer)) 62 throw new RuntimeException("ContentsEqual failure"); 63 } 64 } 65 66 // Test StringBuilder as a CharSequence using new method in 1.5 67 public static void testStringBuilder() throws Exception { 68 for (int i=0; i<ITERATIONS; i++) { 69 int length = rnd.nextInt(STR_LEN) + 1; 70 StringBuilder testStringBuilder = new StringBuilder(); 71 for(int x=0; x<length; x++) { 72 char aChar = (char)rnd.nextInt(); 73 testStringBuilder.append(aChar); 74 } 75 String testString = testStringBuilder.toString(); 76 char c = testStringBuilder.charAt(0); 77 testStringBuilder.setCharAt(0, 'c'); 78 testStringBuilder.setCharAt(0, c); 79 if (!testString.contentEquals(testStringBuilder)) 80 throw new RuntimeException("ContentsEqual failure"); 81 } 82 } 83 84 // Test a String as a CharSequence. This takes a different codepath in 85 // the new method in 1.5 86 public static void testString() throws Exception { 87 for (int i=0; i<ITERATIONS; i++) { 88 int length = rnd.nextInt(STR_LEN) + 1; 89 StringBuilder testStringBuilder = new StringBuilder(); 90 for(int x=0; x<length; x++) { 91 char aChar = (char)rnd.nextInt(); 92 testStringBuilder.append(aChar); 93 } 94 String testString = testStringBuilder.toString(); 95 char c = testStringBuilder.charAt(0); 96 testStringBuilder.setCharAt(0, 'c'); 97 testStringBuilder.setCharAt(0, c); 98 if (!testString.contentEquals(testStringBuilder.toString())) 99 throw new RuntimeException("ContentsEqual failure"); 100 } 101 } 102 103 // Test a CharSequence that is not an AbstractStringBuilder, 104 // this takes a different codepath in the new method in 1.5 105 public static void testCharSequence() throws Exception { 106 for (int i=0; i<ITERATIONS; i++) { 107 int length = rnd.nextInt(STR_LEN) + 1; 108 StringBuilder testStringBuilder = new StringBuilder(); 109 for(int x=0; x<length; x++) { 110 char aChar = (char)rnd.nextInt(); 111 testStringBuilder.append(aChar); 112 } 113 String testString = testStringBuilder.toString(); 114 char c = testStringBuilder.charAt(0); 115 testStringBuilder.setCharAt(0, 'c'); 116 testStringBuilder.setCharAt(0, c); 117 CharBuffer buf = CharBuffer.wrap(testStringBuilder.toString()); 118 if (!testString.contentEquals(buf)) 119 throw new RuntimeException("ContentsEqual failure"); 120 } 121 } 122 }