题解 | #简单密码#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    private static char[] arr = new char[]{
        '2', '2', '2', '3', '3', '3', '4', '4', '4', '5', '5', '5', '6', '6', '6',
        '7', '7', '7', '7', '8', '8', '8', '9', '9', '9', '9'
    };
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        char[] chars = in.nextLine().toCharArray();

        for(char ch : chars){
            if(Character.isLowerCase(ch)){
                System.out.print(arr[ch - 'a']);
                continue;
            }
            if(Character.isUpperCase(ch) && ch != 'Z'){
                ch = (char) (Character.toLowerCase(ch) + 1);
                System.out.print(ch);
                continue;
            }
            if(ch == 'Z'){
                System.out.print('a');
                continue;
            }
            System.out.print(ch);
        }
    }
}