初学java之大数处理

 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 }

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