java数字自动补零

public class P {
 public static void main(String[] args){
  String pattern="000";
  java.text.DecimalFormat df = new java.text.DecimalFormat(pattern);
  int i = 10,j=6;
  System.out.println("i="+df.format(i)+"/nj="+df.format(j));
 }
}
---------------------输出-----------------------
i=010
j=006