数字格式化

import java.text.*;
public class Example8_19 {
	public static void main(String[] args) {
		int n=123456789;
		System.out.println("整数"+n+"按千分组(带正号):");
		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);
	}
}