初学java之大数处理

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