Android String Trim trimStart(String s, String extraChars)

Description

Trim characters from only the beginning of a string.

License

Apache License

Parameter

Parameter	Description
s	String to be trimmed
extraChars	Characters in addition to whitespace characters that should be trimmed. May be null.

Return

String with whitespace and characters in extraChars removed from the beginning

Declaration

public static String trimStart(String s, String extraChars) 

Method Source Code

//package com.java2s;
/**//from w  ww  . j  ava  2 s  . c  o m
 * Copyright (c) 2000, Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    /**
     * Trim characters from only the beginning of a string.
     * This is a convenience method, it simply calls trimStart(s, null).
     *
     * @param s String to be trimmed
     * @return String with whitespace characters removed from the beginning
     */
    public static String trimStart(String s) {
        return trimStart(s, null);
    }

    /**
     * Trim characters from only the beginning of a string.
     * This method will remove all whitespace characters
     * (defined by Character.isWhitespace(char), in addition to the characters
     * provided, from the end of the provided string.
     *
     * @param s String to be trimmed
     * @param extraChars Characters in addition to whitespace characters that
     *                   should be trimmed.  May be null.
     * @return String with whitespace and characters in extraChars removed
     *                   from the beginning
     */
    public static String trimStart(String s, String extraChars) {
        int trimCount = 0;
        while (trimCount < s.length()) {
            char ch = s.charAt(trimCount);
            if (Character.isWhitespace(ch)
                    || (extraChars != null && extraChars.indexOf(ch) >= 0)) {
                trimCount++;
            } else {
                break;
            }
        }

        if (trimCount == 0) {
            return s;
        }
        return s.substring(trimCount);
    }
}

Related

1. trimSpace(String oldString)
2. rightTrimSize(String s)
3. trim(String s, char c)
4. trim(String trimStr, String trimChars)
5. trimEnd(String s, String extraChars)
6. betterTrim(String input)