A 강조하기(with.Java)

class Solution {
    public String solution(String myString) {
        StringBuilder result = new StringBuilder();
        for (int i = 0; i < myString.length(); i++) {
            char currentChar = myString.charAt(i);
            if (currentChar == 'a') {
                result.append('A');
            }else if(currentChar == 'A'){
                result.append(currentChar);
            }else if (Character.isUpperCase(currentChar)) {
                result.append(Character.toLowerCase(currentChar));
            }else {
                result.append(currentChar);
            }
        }
        return result.toString();
    }
}