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 {
    public static void main(String[] args) {
        //字符串数据接收 遍历将大写转为小写并向后移一位
        //解密 根据九键进行规则对应
        Scanner scanner = new Scanner(System.in);
        String password = scanner.nextLine();
        char[] passwordChar = password.toCharArray();

        //遍历 大写变小写 并向后移动一位
        for (int i = 0; i < passwordChar.length; i++) {
            if (passwordChar[i] >= 'A' && passwordChar[i] <= 'Z') {
                if (passwordChar[i] == 'Z') {
                    passwordChar[i] = 'a';
                } else {
                    passwordChar[i] = (char) (passwordChar[i] + 33);
                }
            } else {
                switch (passwordChar[i]) {
                    case 'a':
                    case 'b':
                    case 'c':
                        passwordChar[i] = '2';
                        break;
                    case 'd':
                    case 'e':
                    case 'f':
                        passwordChar[i] = '3';
                        break;
                    case 'g':
                    case 'h':
                    case 'i':
                        passwordChar[i] = '4';
                        break;
                    case 'j':
                    case 'k':
                    case 'l':
                        passwordChar[i] = '5';
                        break;
                    case 'm':
                    case 'n':
                    case 'o':
                        passwordChar[i] = '6';
                        break;
                    case 'p':
                    case 'q':
                    case 'r':
                    case 's':
                        passwordChar[i] = '7';
                        break;
                    case 't':
                    case 'u':
                    case 'v':
                        passwordChar[i] = '8';
                        break;
                    case 'w':
                    case 'x':
                    case 'y':
                    case 'z':
                        passwordChar[i] = '9';
                        break;
                }
            }

        }
        System.out.println(passwordChar);
    }
}