Java Data Type - 如何组编号与(“＃，###，###”)

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);

  }
}