Lv.0 대문자로 바꾸기

문제 풀이

import java.util.*;

class Solution {
    public String solution(String myString) {
        char[] charArray = myString.toCharArray();

        StringBuilder answerBuilder = new StringBuilder();
        for (int i = 0; i < charArray.length; i++) {
            if (Character.isLowerCase(charArray[i]))
                answerBuilder.append(Character.toUpperCase(charArray[i]));
            else
                answerBuilder.append(charArray[i]);
        }
        return answerBuilder.toString();
    }
}