코딩테스트 연습 - 대소문자 바꿔서 출력하기

import java.util.Scanner;

public class Solution {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String a = sc.next();
        char[] arr = a.toCharArray();
        for(char c : arr) {
            if(Character.isUpperCase(c)) {
                c = Character.toLowerCase(c);
            } else {
                c = Character.toUpperCase(c);               
            }
            System.out.print(c);
        }
    }
}

char[] arr = a.toCharArray();
        for(char c : arr) {
            if(Character.isUpperCase(c)) {
                c = Character.toLowerCase(c);
            } else {
                c = Character.toUpperCase(c);               
            }
            System.out.print(c);
        } 추가