题解 | #简单密码#

import java.lang.String;
import java.util.HashMap;
import java.util.Scanner;
import java.util.Set;
import java.util.Map;

// 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 scanner = new Scanner(System.in);
        String from = scanner.nextLine();
        String s = "abcdefghijklmnopqrstuvwxyz";
        HashMap<String, String> hashMap = new HashMap<>();
        hashMap.put("abc", "2");
        hashMap.put("def", "3");
        hashMap.put("ghi", "4");
        hashMap.put("jkl", "5");
        hashMap.put("mno", "6");
        hashMap.put("pqrs", "7");
        hashMap.put("tuv", "8");
        hashMap.put("wxyz", "9");
        for (int i = 0; i < from.length(); i++) {
            char c = from.charAt(i);
            if (Character.isUpperCase(c)) {
                //大写字母
                char newC = Character.toLowerCase(c);
                System.out.print(s.charAt((s.indexOf(newC) + 1) % s.length()));
            } else if (Character.isLowerCase(c)) {
                //小写字母
                Set<Map.Entry<String, String>> entries = hashMap.entrySet();
                for (Map.Entry<String, String> entry : entries) {
                    if (entry.getKey().indexOf(c) > -1) {
                        System.out.print(entry.getValue());
                        break;
                    }
                }
            } else {
                System.out.print(c);
            }
        }
    }
}