Java Char Array Create toCharArray(String s)

Description

toCharArray should return a new array always, however some devices might suffer a bug that allows mutating a String (serious security hole in the JVM) hence this method simulates the proper behavior

License

Open Source License

Parameter

Parameter	Description
s	a string

Return

the contents of the string as a char array guaranteed to be a copy of the current array

Declaration

public static char[] toCharArray(String s)

Method Source Code

//package com.java2s;
/*/* w  w  w. jav a 2  s . c  o m*/
 * Copyright (c) 2008, 2010, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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.
 */

public class Main {
    private static boolean charArrayBugTested;
    private static boolean charArrayBug;

    /**
     * toCharArray should return a new array always, however some devices might
     * suffer a bug that allows mutating a String (serious security hole in the JVM)
     * hence this method simulates the proper behavior
     * @param s a string
     * @return the contents of the string as a char array guaranteed to be a copy of the current array
     */
    public static char[] toCharArray(String s) {
        // toCharArray should return a new array always, however some devices might
        // suffer a bug that allows mutating a String (serious security hole in the JVM)
        // hence this method simulates the proper behavior
        if (!charArrayBugTested) {
            charArrayBugTested = true;
            if (s.toCharArray() == s.toCharArray()) {
                charArrayBug = true;
            }
        }
        if (charArrayBug) {
            char[] c = new char[s.length()];
            System.arraycopy(s.toCharArray(), 0, c, 0, c.length);
            return c;
        }
        return s.toCharArray();
    }
}