[람다 스트림] [문자열] [자바] [백준] - 11655 ROT13

https://www.acmicpc.net/problem/11655

package boj.String;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.stream.Collectors;

public class boj_11655 {
    public static void main(String[] args) throws IOException {
        BufferedReader r = new BufferedReader(new InputStreamReader(System.in));

                String encrypted = r.readLine().chars() // 문자 스트림 생성
                .mapToObj(c -> (char) c)
                .map(c -> {
                    if (c >= 'A' && c <= 'Z') {
                        return (char) ('A' + (c - 'A' + 13) % 26);
                    } else if (c >= 'a' && c <= 'z') {
                        return (char) ('a' + (c - 'a' + 13) % 26);
                    }
                    return c;
                })
                .map(String::valueOf)
                .collect(Collectors.joining());

        System.out.println(encrypted);
    }
}