Java Programming

I am trying to figure out an easy way to pad a string with spaces at the end. The way that definitely works is a for loop where string = string + " "; until string is the length that I need. However, for several dozen strings this is a lot of unnecessary overhead. I've done some research and tried a few different things - yet none of them seem to actually pad the string.

import org.apache.commons.lang.StringUtils;

public class Test
{
	public static void main(String[] args)
	{
		String one = "1234";
	
                //print string at current lenght
		System.out.println(one+"*"); 

                //try padding using String.format (in padRight method below)
		one = padRight(one,(8-one.length()));
		System.out.println(one+"*");

                one="1234";
                //try padding using StringUtils
		String tmp = StringUtils.rightPad(one, (8-one.length()));
		System.out.println(tmp+"*");
	}
	
	private static String padRight(String s, int n)
	{
		return String.format("%1$-" + n + "s", s);
	}
}

I've researched and these are the two most common methods people are suggesting. I am using java 1.5 so the String.format should work.. however, when I run it (I use JBuilder) the output is always "1234*".... after I try to pad it the output should be "1234 *" (with 4 spaces between the 4 and *) . Any suggestions is greatly appreciated! Thanks in advance.