java 천단위 콤마 출력

import java.text.DecimalFormat;

public class Price1000Comma {

  public static void main(String[] args) {
           DecimalFormat df = new DecimalFormat("#,###.######");
           double amtDouble = 1234567890.123456;
           String amtString = df.format(amtDouble); 
           System.out.println(amtString);
  }

}