Java tutorial
import java.util.Formatter; public class Main { public static void main(String[] argv) throws Exception { Formatter fmt = new Formatter(); fmt.format("No group separators: %d\n", 123456789); fmt.format("With group separators: %,d\n\n", 123456789); System.out.println(fmt); } } /*No group separators: 123456789 With group separators: 123,456,789 */