import java.text.DecimalFormat;
import java.text.NumberFormat;
public class Main {
public static void main(String[] argv) throws Exception {
NumberFormat formatter = new DecimalFormat("#,###,###");
String s = formatter.format(-1234.567);
System.out.println(s);
s = formatter.format(-1234567.890);
System.out.println(s);
}
}
// -1,235
// -1,234,568