Java String Reverse reverseCommaDelimitedString(final String string)

Description

Reverses a string which consists of comma-separated items.

License

Open Source License

Parameter

Parameter	Description
string	the given string

Return

the string with the comma-separated items reversed

Declaration

public static String reverseCommaDelimitedString(final String string) 

Method Source Code

//package com.java2s;
/*/*from   w w w  .  ja  v a2  s  .  co m*/
 * StringUtils.java
 *
 * Created on October 4, 2006, 2:36 PM
 *
 * Description:
 *
 * Copyright (C) 2006 Stephen L. Reed.
 *
 * 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 2 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, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

import java.util.ArrayList;

import java.util.List;

public class Main {
    /** Reverses a string which consists of comma-separated items.
     *  "a, b, c" --> "c, b, a"
     *
     * @param string the given string
     * @return the string with the comma-separated items reversed
     */
    public static String reverseCommaDelimitedString(final String string) {
        final List<String> items = new ArrayList<>();
        final int string_len = string.length();
        int index = 0;
        for (int i = 0; i < string_len; i++) {
            final char ch = string.charAt(i);
            if (ch == ',') {
                if (i > index) {
                    items.add(string.substring(index, i).trim());
                }
                index = i + 1;
            }
        }
        if (index < string_len) {
            items.add(string.substring(index).trim());
        }

        final StringBuilder stringBuilder = new StringBuilder();
        boolean isFirst = true;
        for (int i = items.size() - 1; i >= 0; i--) {
            if (isFirst) {
                isFirst = false;
            } else {
                stringBuilder.append(", ");
            }
            stringBuilder.append(items.get(i));
        }
        return stringBuilder.toString();
    }
}

Related

1. getReverseShelfKey(String shelfkey)
2. reverse(String aPackage)
3. reverse(String s)
4. reverse(String text)
5. reverse(String word)
6. reverseDelimited(String str, char separatorChar)
7. reverseUseSB(String str)