How to remove only trailing spaces of a string in Java and keep leading spaces?

Question

The trim() function removes both the trailing and leading space, however, if I only want to remove the trailing space of a string, how can I do it?

Answer 1

The best way in my opinion:

public static String trimEnd(String source) {
    int pos = source.length() - 1;
    while ((pos >= 0) && Character.isWhitespace(source.charAt(pos))) {
        pos--;
    }
    pos++;
    return (pos < source.length()) ? source.substring(0, pos) : source;
}

This does not allocate any temporary object to do the job and is faster than using a regular expression. Also it removes all whitespaces, not just ' '.