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 }