BOJ_11655_ROT13

ROT13.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class ROT13 {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        char[] chars = br.readLine().trim().toCharArray();
        int len = chars.length;
        char[] resultChars = new char[len];

        for (int i = 0; i < len; i++) {
            char tempChar = chars[i];
            int charCode = (int) tempChar;

            // 알파벳 대문자
            if (65 <= charCode && charCode <= 90) {
                if (charCode + 13 > 90) {
                    resultChars[i] = (char)(65 + (13 - (90-charCode)) - 1);
                } else {
                    resultChars[i] = (char)(charCode + 13);
                }
            // 알파벳 소문자
            } else if (97 <= charCode && charCode <= 122) {
                if (charCode + 13 > 122) {
                    resultChars[i] = (char)(97 + (13 - (122-charCode)) - 1);
                } else {
                    resultChars[i] = (char)(charCode + 13);
                }
            } else {
                resultChars[i] = tempChar;
            }

        }

        System.out.println(resultChars);

    }

}

좀더 간결하게 할 수 있는 방법이 있을까...