Quelle ContentEquals.java Sprache: JAVA

/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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* questions.
*/

/*
* @test
* @bug 4242309 4982981
* @summary Test equals and contentEquals in String
* @key randomness
*/
import java.util.Random;
import java.nio.CharBuffer;

// Yes, I used cut and paste for this test. Yes more code
// sharing could have been accomplished.
public class ContentEquals {

    private static Random rnd = new Random();
    private static final int ITERATIONS = 1000;
    private static final int STR_LEN = 20;

    public static void main(String[] args) throws Exception {
        testStringBuffer();
        testStringBuilder();
        testString();
        testCharSequence();
    }

    // Test a StringBuffer, which uses the old method from 1.4
    public static void testStringBuffer() throws Exception {
        for (int i=0; i<ITERATIONS; i++) {
            int length = rnd.nextInt(STR_LEN) + 1;
            StringBuffer testStringBuffer = new StringBuffer();
            for(int x=0; x<length; x++) {
                char aChar = (char)rnd.nextInt();
                testStringBuffer.append(aChar);
            }
            String testString = testStringBuffer.toString();
            char c = testStringBuffer.charAt(0);
            testStringBuffer.setCharAt(0, 'c');
            testStringBuffer.setCharAt(0, c);
            if (!testString.contentEquals(testStringBuffer))
                throw new RuntimeException("ContentsEqual failure");
        }
    }

    // Test StringBuilder as a CharSequence using new method in 1.5
    public static void testStringBuilder() throws Exception {
        for (int i=0; i<ITERATIONS; i++) {
            int length = rnd.nextInt(STR_LEN) + 1;
            StringBuilder testStringBuilder = new StringBuilder();
            for(int x=0; x<length; x++) {
                char aChar = (char)rnd.nextInt();
                testStringBuilder.append(aChar);
            }
            String testString = testStringBuilder.toString();
            char c = testStringBuilder.charAt(0);
            testStringBuilder.setCharAt(0, 'c');
            testStringBuilder.setCharAt(0, c);
            if (!testString.contentEquals(testStringBuilder))
                throw new RuntimeException("ContentsEqual failure");
        }
    }

    // Test a String as a CharSequence. This takes a different codepath in
    // the new method in 1.5
    public static void testString() throws Exception {
        for (int i=0; i<ITERATIONS; i++) {
            int length = rnd.nextInt(STR_LEN) + 1;
            StringBuilder testStringBuilder = new StringBuilder();
            for(int x=0; x<length; x++) {
                char aChar = (char)rnd.nextInt();
                testStringBuilder.append(aChar);
            }
            String testString = testStringBuilder.toString();
            char c = testStringBuilder.charAt(0);
            testStringBuilder.setCharAt(0, 'c');
            testStringBuilder.setCharAt(0, c);
            if (!testString.contentEquals(testStringBuilder.toString()))
                throw new RuntimeException("ContentsEqual failure");
        }
    }

    // Test a CharSequence that is not an AbstractStringBuilder,
    // this takes a different codepath in the new method in 1.5
    public static void testCharSequence() throws Exception {
        for (int i=0; i<ITERATIONS; i++) {
            int length = rnd.nextInt(STR_LEN) + 1;
            StringBuilder testStringBuilder = new StringBuilder();
            for(int x=0; x<length; x++) {
                char aChar = (char)rnd.nextInt();
                testStringBuilder.append(aChar);
            }
            String testString = testStringBuilder.toString();
            char c = testStringBuilder.charAt(0);
            testStringBuilder.setCharAt(0, 'c');
            testStringBuilder.setCharAt(0, c);
            CharBuffer buf = CharBuffer.wrap(testStringBuilder.toString());
            if (!testString.contentEquals(buf))
                throw new RuntimeException("ContentsEqual failure");
        }
    }
}

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