密钥加密问题

C++参考代码：

#include
#include

 Java参考代码：

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
      Scanner scan = new Scanner(System.in);
      Map map = new HashMap();
      ArrayList word = new ArrayList<>();
      String key = scan.nextLine();
      String essay = scan.nextLine();
      for(char ch = key.charAt(0);ch<='Z';ch++) word.add(ch);
      for(char ch = 'A';ch='A'&&essay.charAt(i)<='Z') System.out.print(map.get(essay.charAt(i)));
    	  else System.out.print(essay.charAt(i));
      }
      scan.close();
    }
}