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 /* @test 24 * @bug 6206780 25 * @summary Test StringBuffer.append(StringBuilder); 26 */ 27 28 import java.util.Random; 29 30 public class AppendStringBuilder { 31 private static Random generator = new Random(); 32 33 public static void main(String[] args) throws Exception { 34 for (int i=0; i<1000; i++) { 35 StringBuilder sb1 = generateTestBuilder(10, 100); 36 StringBuilder sb2 = generateTestBuilder(10, 100); 37 StringBuilder sb3 = generateTestBuilder(10, 100); 38 String s1 = sb1.toString(); 39 String s2 = sb2.toString(); 40 String s3 = sb3.toString(); 41 42 String concatResult = new String(s1+s2+s3); 43 44 StringBuffer test = new StringBuffer(); 45 test.append(sb1); 46 test.append(sb2); 47 test.append(sb3); 48 49 if (!test.toString().equals(concatResult)) 50 throw new RuntimeException("StringBuffer.append failure"); 51 } 52 } 53 54 private static int getRandomIndex(int constraint1, int constraint2) { 55 int range = constraint2 - constraint1; 56 int x = generator.nextInt(range); 57 return constraint1 + x; 58 } 59 60 private static StringBuilder generateTestBuilder(int min, int max) { 61 StringBuilder aNewStringBuilder = new StringBuilder(120); 62 int aNewLength = getRandomIndex(min, max); 63 for(int y=0; y<aNewLength; y++) { 64 int achar = generator.nextInt(30)+30; 65 char test = (char)(achar); 66 aNewStringBuilder.append(test); 67 } 68 return aNewStringBuilder; 69 } 70 }