Trim any of the characters contained in the second string from the beginning and end of the first. - Java java.lang

Java examples for java.lang:String Trim

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Description

Trim any of the characters contained in the second string from the beginning and end of the first.

Demo Code

/*/*  www  .  ja v  a2  s  . c  om*/
 * Static String formatting and query routines.
 * Copyright (C) 2001-2005 Stephen Ostermiller
 * http://ostermiller.org/contact.pl?regarding=Java+Utilities
 *
 * 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.
 *
 * See COPYING.TXT for details.
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) {
        String s = "java2s.com";
        String c = "java2s.com";
        System.out.println(trim(s, c));
    }

    /**
     * Trim any of the characters contained in the second
     * string from the beginning and end of the first.
     *
     * @param s String to be trimmed.
     * @param c list of characters to trim from s.
     * @return trimmed String.
     * @throws NullPointerException if s is null.
     *
     * @since ostermillerutils 1.00.00
     */
    public static String trim(String s, String c) {
        int length = s.length();
        if (c == null) {
            return s;
        }
        int cLength = c.length();
        if (c.length() == 0) {
            return s;
        }
        int start = 0;
        int end = length;
        boolean found; // trim-able character found.
        int i;
        // Start from the beginning and find the
        // first non-trim-able character.
        found = false;
        for (i = 0; !found && i < length; i++) {
            char ch = s.charAt(i);
            found = true;
            for (int j = 0; found && j < cLength; j++) {
                if (c.charAt(j) == ch)
                    found = false;
            }
        }
        // if all characters are trim-able.
        if (!found)
            return "";
        start = i - 1;
        // Start from the end and find the
        // last non-trim-able character.
        found = false;
        for (i = length - 1; !found && i >= 0; i--) {
            char ch = s.charAt(i);
            found = true;
            for (int j = 0; found && j < cLength; j++) {
                if (c.charAt(j) == ch)
                    found = false;
            }
        }
        end = i + 2;
        return s.substring(start, end);
    }
}

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