java 手机号码屏蔽中间四位case(字符串的截取)

package com.yuyang.string;

import java.util.Scanner;

public class Test3 {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入你的手机号码");
        String number=sc.next();
        //2.截取号码的前三位，和后四位
        String before=number.substring(0,3);
        String after=number.substring(7);
        String tel=before+"****"+after;
        System.out.println(tel);
    }
}

请输入你的手机号码
18655046826
186****6826

Process finished with exit code 0