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) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        String str = in.nextLine();
        StringBuilder sb = new StringBuilder();

        char[] ch = str.toCharArray();
        for (int i = 0; i < ch.length; i++) {
            if ('Z' == ch[i]) {
                sb.append('a');
            } else if ('A' <= ch[i] && ch[i] <= 'Y') {
                sb.append(String.valueOf((char)(ch[i] + 32 + 1)));
            } else if ('a' <= ch[i] && ch[i] <= 'z') {
                if ("abc".contains(String.valueOf(ch[i]))) {
                    sb.append("2");
                } else if ("def".contains(String.valueOf(ch[i]))) {
                    sb.append("3");
                } else if ("ghi".contains(String.valueOf(ch[i]))) {
                    sb.append("4");
                } else if ("jkl".contains(String.valueOf(ch[i]))) {
                    sb.append("5");
                } else if ("mno".contains(String.valueOf(ch[i]))) {
                    sb.append("6");
                } else if ("pqrs".contains(String.valueOf(ch[i]))) {
                    sb.append("7");
                } else if ("tuv".contains(String.valueOf(ch[i]))) {
                    sb.append("8");
                } else {
                    sb.append("9");
                }
            } else {
                sb.append(String.valueOf(ch[i]));
            }
        }

        System.out.println(sb.toString());
    }
}