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