Quellcode-Bibliothek

^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: MinMax.java Sprache: JAVA

/*
* Copyright (c) 2001, 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
* @bug 4486049
* @summary min and max methods fail if size changes in between a call to size
*           and an attempt to iterate.
* @author Josh Bloch
*/

import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;

public class MinMax {
    public static void main(String[] args) {
        Set s = new LyingSet();
        s.add("x");
        if (!Collections.min(s).equals("x"))
            throw new RuntimeException("1: " + Collections.min(s));
        if (!Collections.max(s).equals("x"))
            throw new RuntimeException("2: " + Collections.max(s));

        s.add("y");
        if (!Collections.min(s).equals("x"))
            throw new RuntimeException("3: " + Collections.min(s));
        if (!Collections.max(s).equals("y"))
            throw new RuntimeException("4: " + Collections.max(s));

        s.add("w");
        if (!Collections.min(s).equals("w"))
            throw new RuntimeException("5: " + Collections.min(s));
        if (!Collections.max(s).equals("y"))
            throw new RuntimeException("6: " + Collections.max(s));

        s.clear();
        s.add("x");
        if (!Collections.min(s, Collections.reverseOrder()).equals("x"))
            throw new RuntimeException("1a: " + Collections.min(s));
        if (!Collections.max(s, Collections.reverseOrder()).equals("x"))
            throw new RuntimeException("2a: " + Collections.max(s));

        s.add("y");
        if (!Collections.min(s, Collections.reverseOrder()).equals("y"))
            throw new RuntimeException("3a: " + Collections.min(s));
        if (!Collections.max(s, Collections.reverseOrder()).equals("x"))
            throw new RuntimeException("4a: " + Collections.max(s));

        s.add("w");
        if (!Collections.min(s, Collections.reverseOrder()).equals("y"))
            throw new RuntimeException("5a: " + Collections.min(s));
        if (!Collections.max(s, Collections.reverseOrder()).equals("w"))
            throw new RuntimeException("6a: " + Collections.max(s));
    }
}

class LyingSet extends LinkedHashSet {
    public int size() {
        return super.size() + 1; // Lies, lies, all lies!
    }
}

¤ Dauer der Verarbeitung: 0.1 Sekunden (vorverarbeitet) ¤

Download des Quellennavigators
Download des sprechenden Kalenders
in der Quellcodebibliothek suchen

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.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.