73 lines
2.6 KiB
Java
73 lines
2.6 KiB
Java
/*
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* Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* @test
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* @bug 4144267
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* @summary Test StringBuffer.append(StringBuffer);
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* @key randomness
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*/
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import java.util.Random;
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public class AppendSB {
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private static Random generator = new Random();
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public static void main(String[] args) throws Exception {
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for (int i=0; i<1000; i++) {
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StringBuffer sb1 = generateTestBuffer(10, 100);
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StringBuffer sb2 = generateTestBuffer(10, 100);
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StringBuffer sb3 = generateTestBuffer(10, 100);
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String s1 = sb1.toString();
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String s2 = sb2.toString();
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String s3 = sb3.toString();
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String concatResult = new String(s1+s2+s3);
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StringBuffer test = new StringBuffer();
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test.append(sb1);
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test.append(sb2);
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test.append(sb3);
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if (!test.toString().equals(concatResult))
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throw new RuntimeException("StringBuffer.append failure");
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}
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}
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private static int getRandomIndex(int constraint1, int constraint2) {
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int range = constraint2 - constraint1;
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int x = generator.nextInt(range);
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return constraint1 + x;
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}
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private static StringBuffer generateTestBuffer(int min, int max) {
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StringBuffer aNewStringBuffer = new StringBuffer(120);
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int aNewLength = getRandomIndex(min, max);
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for(int y=0; y<aNewLength; y++) {
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int achar = generator.nextInt(30)+30;
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char test = (char)(achar);
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aNewStringBuffer.append(test);
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}
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return aNewStringBuffer;
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}
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}
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