1 /*

     2  * Copyright (c) 2000, 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 4144267

    26  * @summary Test StringBuffer.append(StringBuffer);

    27  * @key randomness

    28  */

    29 

    30 import java.util.Random;

    31 

    32 public class AppendSB {

    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             StringBuffer test = new StringBuffer();

    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 }