java截取字符串

package com.hanqi;
import java.util.*;
import java.util.Scanner;

public class shenfenzhenghaojiance {
    public static void main(String[] args)
    {  
        System.out.println("请输入一个身份证号码：");
        Scanner sc=new Scanner(System.in);
        String a = sc.next();
     System.out.println(a.substring(6,10)+"年"+a.substring(10,12)+"月"+a.substring(12,14)+"日今天是你的出生年月日");
    
    }

}