Java Unicode Unescape unescapeUnicode(String s)

Description

Unescapes unicode sequences and stores them as unicode characters instead.

License

Open Source License

Parameter

Parameter	Description
s	the string to process

Return

the unescaped string

Declaration

public static String unescapeUnicode(String s) 

Method Source Code

//package com.java2s;
/*/*w  ww. ja v a2  s.  co  m*/
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program 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 for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

public class Main {
    /**
     * Unescapes unicode sequences and stores them as unicode characters instead.
     *
     * @param s        the string to process
     * @return      the unescaped string
     */
    public static String unescapeUnicode(String s) {
        StringBuilder result;
        int index;
        String unicode;
        char[] chars;

        if (!s.contains("\\u"))
            return s;

        result = new StringBuilder();
        while ((index = s.indexOf("\\u")) > -1) {
            result.append(s.substring(0, index));
            s = s.substring(index + 2);
            if (s.length() >= 4) {
                unicode = s.substring(0, 4).toUpperCase();
                s = s.substring(4);
                chars = Character.toChars(Integer.parseInt(unicode, 16));
                for (char c : chars)
                    result.append(c);
            } else {
                result.append("\\u");
            }
        }
        result.append(s);

        return result.toString();
    }
}

Related

1. unescapeHTMLUnicodeEntity(final String text)
2. unescapeUnicode(String encoded)
3. unescapeUnicode(String s)
4. unescapeUnicodeChars(String string)