题解 | #字符串加密#

import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Scanner; import java.util.Set; import java.util.TreeSet;

public class Main {

public static void main(String[] args) {
	
	
	// TODO Auto-generated method stub
	   Scanner in = new Scanner(System.in);
	   String key = in.nextLine();
	   String message = in.nextLine();
	   
	   Set<Character> set = new HashSet<>();
	   List<Character> charList = new ArrayList<Character>();
	   
	   for(int i=0; i<key.length(); i++)
	   {
		   if(set.add(key.charAt(i)))
		   {
			   charList.add(key.charAt(i));
		   }
	   }
	   
	   
	   for(char cur='a'; cur<='z'; cur=(char) (cur+1))
	   {
		   if(set.add(cur))
		   {
			   charList.add(cur);
		   }
	   }
	   
	   StringBuilder sb = new StringBuilder();
	   
	   for(int i=0; i<message.length(); i++)
	   {
		   char curChar = message.charAt(i);
		   if(Character.isLowerCase(curChar))
		   {
			   int index = curChar - 'a';
			   char codeChar = charList.get(index);
			   sb.append(codeChar);
		   }else
		   {
			   int index = curChar - 'A';
			   char codeChar = charList.get(index);
			   codeChar =Character.toUpperCase(codeChar);	
			   sb.append(codeChar);
		   }
		 
	   }
	   System.out.println(sb);
	   
}

}