Phone number shielding function

demand

Enter a mobile phone number with the keyboard , Block the middle four digits , The final effect is ：

analysis

① Enter a string on the keyboard .
② Call the interception of string object API, Intercept the first three bits of the string 、 The last four .
③ Top three Connect “****” Then continue to connect the last four digits , Just output the final result .

Code

package com.xxf1.string;

import java.util.Scanner;

/* *  Mobile phone number shielding  * */
public class StringDemo3 {
    
    public static void main(String[] args) {
    
        //1、 Enter the phone number on the keyboard 
        Scanner sc = new Scanner(System.in);
        System.out.println(" Please enter your mobile number ：");
        String tel = sc.next();
        //2、 Intercept the first three and last four digits of the number 
        String before = tel.substring(0, 3);
        String after = tel.substring(7);
        String s = before + "****" + after;
        System.out.println(s);
    }


}

test