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

Here's a very short, efficient and easy-to-read version:

public static String trimTrailing(String str) {
    if (str != null) {
        for (int i = str.length() - 1; i >= 0; --i) {
            if (str.charAt(i) != ' ') {
                return str.substring(0, i + 1);
            }
        }
    }
    return str;
}

As an alternative to str.charAt(i) != ' ' you can also use !Character.isWhitespace(str.charAt(i) if you want to use a broader definition of whitespace.