[JAVA/프로그래머스] 연습문제: 핸드폰 번호 가리기

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/**
 *
 * @author HEESOO
 *
 */
 class Solution {
   public String solution(String phone_number) {
       String answer = "";
       int i=0;
       int lastIdx=phone_number.length()-1;
       while(i<4){
           answer=phone_number.charAt(lastIdx-i)+answer;
           i++;
       }
       while(i<=lastIdx){
           answer="*"+answer;
           i++;
       }
       return answer;
   }
 }