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 }