Java写题解的第1天 | #简单密码#

将接受的字符串转换为字符数组的形式以便于在原位转换;

import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException { 
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String s = "";
        while ((s = br.readLine()) != null) {
            char[] cs = s.toCharArray();
            for(int i = 0; i < cs.length; i++) {
                cs[i] = singleTransfer(cs[i]);
            }
            System.out.println(new String(cs));
        }
    }

    public static char singleTransfer(char c) {
        if ('0' <= c && c <= '9') {
            return c;
        } else if ('A' <= c && c <= 'Y') {
            return (char)(c + 'b' - 'A');
        } else if (c == 'Z') {
            return 'a';
        } else {
            switch (c) {
                case 'a':
                case 'b':
                case 'c':
                    return '2';
                case 'd':
                case 'e':
                case 'f':
                    return '3';
                case 'g':
                case 'h':
                case 'i':
                    return '4';
                case 'j':
                case 'k':
                case 'l':
                    return '5';
                case 'm':
                case 'n':
                case 'o':
                    return '6';
                case 'p':
                case 'q':
                case 'r':
                case 's':
                    return '7';
                case 't':
                case 'u':
                case 'v':
                    return '8';
                default:
                    return '9';
            }
        }
    }
}