题解 | #简单密码#

import java.util.*;
public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        char[] c = s.toCharArray();
        for (int i = 0; i < c.length; i++) {
            if(c[i]>='a'&&c[i]<='z'){
                switch(c[i]){
                    case 'a':
                    case 'b':
                    case 'c':
                        c[i]='2';
                        break;
                    case 'd':
                    case 'e':
                    case 'f':
                        c[i]='3';
                        break;
                    case 'g':
                    case 'h':
                    case 'i':
                        c[i]='4';
                        break;
                    case 'j':
                    case 'k':
                    case 'l':
                        c[i]='5';
                        break;
                    case 'm':
                    case 'n':
                    case 'o':
                        c[i]='6';
                        break;
                    case 'p':
                    case 'q':
                    case 'r':
                    case 's':
                        c[i]='7';
                        break;
                    case 't':
                    case 'u':
                    case 'v':
                        c[i]='8';
                        break;
                    case 'w':
                    case 'x':
                    case 'y':
                    case 'z':
                        c[i]='9';
                        break;
                }
            }
            if(c[i]>='A'&&c[i]<='Z'){
                if(c[i]=='Z'){
                    c[i]='a';
                }else {
                    c[i] = (char) ((int) (c[i]) + 33);
                }
            }
        }
        for (int i = 0; i < c.length; i++) {
            System.out.print(c[i]);
        }
    }
}