1 import java.text.*;
 2 public class Gxjun
 3 { 
 4 public static void main(String args[] )
 5 {
 6 int n=123456789;
 7 System.out.println("整数"+"按千分组号（带正好）");
 8 String s=String.format("%,+d",n);
 9 System.out.println(s);
10 double number = 98765.6789 ;
11 System.out.println(number+"格式化为整数7位,小数3位"); 
12 s=String.format("%011.3f",number);
13 System.out.println(s);
14 }
15 }