Ziele Untersuchung
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Denken Kreativität

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


products/Sources/formale Sprachen/Java/Openjdk/test/jdk/java/lang/String/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 4 kB

Quelle StringRepeat.java Sprache: JAVA

/*
* Copyright (c) 2018, 2021, Oracle and/or its affiliates. All rights reserved.
* 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.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

/*
* @test
* @summary This exercises String#repeat patterns and limits.
* @run main/othervm StringRepeat
*/

/*
* @test
* @summary This exercises String#repeat patterns with 16 * 1024 * 1024 repeats.
* @requires os.maxMemory >= 2G
* @run main/othervm -Xmx2g StringRepeat 16777216
*/

import java.nio.CharBuffer;

public class StringRepeat {
    public static void main(String... args) {
        if (args.length > 0) {
            REPEATS = new int[args.length];
            for (int i = 0; i < args.length; ++i) {
                REPEATS[i] = Integer.parseInt(args[i]);
            }
        }
        test1();
        test2();
    }

    /*
     * Default varitions of repeat count.
     */
    static int[] REPEATS = {
        0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
        32, 64, 128, 256, 512, 1024, 64 * 1024, 1024 * 1024
    };

    /*
     * Varitions of Strings.
     */
    static String[] STRINGS = new String[] {
            "", "\0",  " ", "a", "$", "\u2022",
            "ab", "abc", "abcd", "abcde",
            "The quick brown fox jumps over the lazy dog."
    };

    /*
     * Repeat String function tests.
     */
    static void test1() {
        for (int repeat : REPEATS) {
            for (String string : STRINGS) {
                long limit = (long)string.length() * (long)repeat;

                if ((long)(Integer.MAX_VALUE >> 1) <= limit) {
                    break;
                }

                verify(string.repeat(repeat), string, repeat);
            }
        }
    }

    /*
     * Repeat String exception tests.
     */
    static void test2() {
        try {
            "abc".repeat(-1);
            throw new RuntimeException("No exception for negative repeat count");
        } catch (IllegalArgumentException ex) {
            // Correct
        }

        try {
            "abc".repeat(Integer.MAX_VALUE - 1);
            throw new RuntimeException("No exception for large repeat count");
        } catch (OutOfMemoryError ex) {
            // Correct
        }
    }

    static String truncate(String string) {
        if (string.length() < 80) {
            return string;
        }
        return string.substring(0, 80) + "...";
    }

    /*
     * Verify string repeat patterns.
     */
    static void verify(String result, String string, int repeat) {
        if (string.isEmpty() || repeat == 0) {
            if (!result.isEmpty()) {
                System.err.format("\"%s\".repeat(%d)%n", truncate(string), repeat);
                System.err.format("Result \"%s\"%n", truncate(result));
                System.err.format("Result expected to be empty, found string of length %d%n", result.length());
                throw new RuntimeException();
            }
        } else {
            int expected = 0;
            int count = 0;
            for (int offset = result.indexOf(string, expected);
                 0 <= offset;
                 offset = result.indexOf(string, expected)) {
                count++;
                if (offset != expected) {
                    System.err.format("\"%s\".repeat(%d)%n", truncate(string), repeat);
                    System.err.format("Result \"%s\"%n", truncate(result));
                    System.err.format("Repeat expected at %d, found at = %d%n", expected, offset);
                    throw new RuntimeException();
                }
                expected += string.length();
            }
            if (count != repeat) {
                System.err.format("\"%s\".repeat(%d)%n", truncate(string), repeat);
                System.err.format("Result \"%s\"%n", truncate(result));
                System.err.format("Repeat count expected to be %d, found %d%n", repeat, count);
                throw new RuntimeException();
            }
        }
    }
}

quality95%

¤ Dauer der Verarbeitung: 0.11 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.