[LEVEL 1] 핸드폰 번호 가리기

문제

 

 

 

답

 

class Solution {
    public String solution(String phone_number) {
        String answer = "";
        
        String front = "";
        String back = "";
        for(int i = 0; i < phone_number.length()-4; i++){
            answer += "*";
        }

        back = phone_number.substring(phone_number.length()-4,phone_number.length());
        answer += back;
        return answer;
        
    }
}