1 /* 2 * Copyright (c) 2012, 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 /* @test 25 * @bug 6206780 26 * @summary Test StringBuilder.append(StringBuffer); 27 * @key randomness 28 */ 29 30 import java.util.Random; 31 32 public class AppendStringBuffer { 33 private static Random generator = new Random(); 34 35 public static void main(String[] args) throws Exception { 36 for (int i=0; i<1000; i++) { 37 StringBuffer sb1 = generateTestBuffer(10, 100); 38 StringBuffer sb2 = generateTestBuffer(10, 100); 39 StringBuffer sb3 = generateTestBuffer(10, 100); 40 String s1 = sb1.toString(); 41 String s2 = sb2.toString(); 42 String s3 = sb3.toString(); 43 44 String concatResult = new String(s1+s2+s3); 45 46 StringBuilder test = new StringBuilder(); 47 test.append(sb1); 48 test.append(sb2); 49 test.append(sb3); 50 51 if (!test.toString().equals(concatResult)) 52 throw new RuntimeException("StringBuffer.append failure"); 53 } 54 } 55 56 private static int getRandomIndex(int constraint1, int constraint2) { 57 int range = constraint2 - constraint1; 58 int x = generator.nextInt(range); 59 return constraint1 + x; 60 } 61 62 private static StringBuffer generateTestBuffer(int min, int max) { 63 StringBuffer aNewStringBuffer = new StringBuffer(120); 64 int aNewLength = getRandomIndex(min, max); 65 for(int y=0; y<aNewLength; y++) { 66 int achar = generator.nextInt(30)+30; 67 char test = (char)(achar); 68 aNewStringBuffer.append(test); 69 } 70 return aNewStringBuffer; 71 } 72 }