[LEVEL1] 문자열다루기 기본

나의풀이

class Solution {
    public boolean solution(String s) {
        boolean answer = true;
        if(s.length()==4||s.length()==6)
        {
            for(int i=0;i<s.length();i++)
            {
               if(s.charAt(i)<48||s.charAt(i)>57)
               {
                     answer=false;
               }
            }
            
        }
        else
        {
            answer=false;
        }
        
        return answer;
    }
}

참고할만한풀이-정규식사용

import java.util.*;

class Solution {
  public boolean solution(String s) {
        if (s.length() == 4 || s.length() == 6) return s.matches("(^[0-9]*$)");
        return false;
  }
}

참고할만한풀이-한줄풀이

class Solution {
  public boolean solution(String s) {
    return (s.length() != 4 && s.length() != 6) || (s.split("[0-9]").length > 0) ? false:true;
  }
}