密码翻译（必须会得偶）

参考代码:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String str=scanner.nextLine();
        String encrypted=encryptedString(str);
        System.out.println(encrypted);
        scanner.close();
    }
    public static String encryptedString(String str){
        StringBuilder result=new StringBuilder();
        for(char c:str.toCharArray()){
            if(Character.isLetter(c)){
                if(c=='z'){
                    result.append('a');
                }else if(c=='Z'){
                    result.append('A');
                }else{
                    char encryptedChar=(char)(c+1);
                    result.append(encryptedChar);
                }
            }else{
                result.append(c);
            }
        }
        return result.toString();
    }
}