Removing spaces at the end of a string in java [duplicate]

Question

Possible Duplicate:
Strip Leading and Trailing Spaces From Java String

When I import data to an application I need to get rid of the spaces at the end of certain strings but not those at the beginning, so I can't use trim()... I've set up a method:

public static String quitarEspaciosFinal(String cadena) {
    String[] trozos = cadena.split(" ");
    String ultimoTrozo = trozos[trozos.length-1];
    return cadena.substring(0,cadena.lastIndexOf(ultimoTrozo.charAt(ultimoTrozo.length()-1))+1);
    }

where cadena is the string I have to transform...

So, if cadena = " 1234 " this method would return " 1234"...

I'd like to know if there's a more efficient way to do this...

Answer 1

I'd do it like this:

public static String trimEnd(String s)
{
    if ( s == null || s.length() == 0 )
        return s;
    int i = s.length();
    while ( i > 0 &&  Character.isWhitespace(s.charAt(i - 1)) )
        i--;
    if ( i == s.length() )
        return s;
    else
        return s.substring(0, i);
}

It's way more verbose than using a regular expression, but it's likely to be more efficient.