[알고리즘문제풀기] 대소문자 바꿔서 출력하기

문제

내가 작성한 정답

import java.util.Scanner;

class Solution {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String a = sc.next();
        StringBuilder sb = new StringBuilder();
        for(char c:a.toCharArray()){
            if(c<='Z' && c>='A') sb.append(Character.toLowerCase(c));
            else if (c>=97 && c<=122) sb.append(Character.toUpperCase(c));
        }
        System.out.println(sb.toString());
    }
}

다른 사람들의 정답

import java.util.*;

public class Solution {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String a = sc.next();
        String answer = "";

        //Stack <Character> stack = new Stack <> ();

        for(Character c : a.toCharArray()){
            if(Character.isUpperCase(c)){
                //stack.push(Character.toLowerCase(c));
                answer += Character.toLowerCase(c);
            }
            else if(Character.isLowerCase(c)){
                //stack.push(Character.toUpperCase(c));
                answer += Character.toUpperCase(c);
            }
        } 
        System.out.println(answer);
    }
}