Java String trimAllWhitespace() Utility Method

Java String Utility Methods


This page contains the source code of String trimAllWhitespace() utility method - Trim all whitespace from the given String: leading, trailing, and in between characters.

Java String trimWhitespace() Utility Method

The following trimWhitespace() utility method trim all whitespace from the given String:
package com.javaguides.strings.utils;

public class StringTrimUtil {

    /**
     * Trim <i>all</i> whitespace from the given {@code String}:
     * leading, trailing, and in between characters.
     * @param str the {@code String} to check
     * @return the trimmed {@code String}
     * @see java.lang.Character#isWhitespace
     */
    public static String trimAllWhitespace(String str) {
        if (!hasLength(str)) {
            return str;
        }

        int len = str.length();
        StringBuilder sb = new StringBuilder(str.length());
        for (int i = 0; i < len; i++) {
            char c = str.charAt(i);
            if (!Character.isWhitespace(c)) {
                sb.append(c);
            }
        }
        return sb.toString();
    }

    /**
     * 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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