[Java] 프로그래머스 : 대소문자 바꿔서 출력하기

https://school.programmers.co.kr/learn/courses/30/lessons/181949

 

import java.util.Scanner;

public class Solution {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String a = sc.next();
        
        String ans = "";
        for(int i=0; i<a.length(); i++) {
            char ch = a.charAt(i);
            if(Character.isUpperCase(ch)) {
                ans += Character.toLowerCase(ch);
            } else {
                ans += Character.toUpperCase(ch);
            }
        }
        
        System.out.println(ans);
    }
}