Java String trimWhitespace() Utility Method

Java String Utility Methods


This page contains the source code of String trimWhitespace() utility method - Trim leading and trailing whitespace from the given String.

Java String trimWhitespace() Utility Method

Trim leading and trailing whitespace from the given String:
package com.javaguides.strings.utils;

public class StringTrimUtil {


    public static void main(String[] args) {

    }
    /**
     * Trim leading and trailing whitespace from the given {@code String}.
     * @param str the {@code String} to check
     * @return the trimmed {@code String}
     * @see java.lang.Character#isWhitespace
     */
    public static String trimWhitespace(String str) {
        if (!hasLength(str)) {
            return str;
        }

        int beginIndex = 0;
        int endIndex = str.length() - 1;

        while (beginIndex <= endIndex && Character.isWhitespace(str.charAt(beginIndex))) {
            beginIndex++;
        }

        while (endIndex > beginIndex && Character.isWhitespace(str.charAt(endIndex))) {
            endIndex--;
        }

        return str.substring(beginIndex, endIndex + 1);
    }

    /**
     * Check that the given String is neither <code>null</code> nor of length 0.
     * Note: Will return <code>true</code> for a String that purely consists of whitespace.
     * <p/>
     * <code>StringUtils.hasLength(null) == false<br/>
     * StringUtils.hasLength("") == false<br/>
     * StringUtils.hasLength(" ") == true<br/>
     * StringUtils.hasLength("Hello") == true</code>
     * <p/>
     * Copied from the Spring Framework while retaining all license, copyright and author information.
     *
     * @param str the String to check (may be <code>null</code>)
     * @return <code>true</code> if the String is not null and has length
     * @see #hasText(String)
     */
    public static boolean hasLength(String str) {
        return (str != null && str.length() > 0);
    }
}

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