i have an int (unknown lenght) that i need to format so there's a comma every 3 digits, like "1,000,203,2203". I know about

DecimalFormat df1 = new

DecimalFormat(), but I'm not quite sure what to put in the parentheses. If I knew the int was 4 digits, I could do "0,000", but I'm not sure how to go about formatting an unknown number of digits. Let me know!

Thanks!