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 }