Java 简单实现Enigma英格玛密码

Posted 2022-10-21 Wiiix

package egnima;
import java.util.Scanner;
public class enigma 
static public void main(String []args)

Scanner cin=new Scanner(System.in);
System.out.print("Input 0 to encode message and 1 to decode message:");
int op=cin.nextInt();
if(op==0)
encode();
	else
	decode();

static void encode()

	String msg="";
	String encodemsg="";
	int count=0;
	System.out.printf("%s","Input the message:");
	Scanner cin=new Scanner(System.in);
	msg=cin.nextLine();
	for(int i=0;i<msg.length();i++)
	
if((Character.isSpace(msg.charAt(i))))

			encodemsg+=" ";
		

		else if((msg.charAt(i)-count)<'a')
		
		encodemsg+=(char)(msg.charAt(i)+26-count);
		
		else
		encodemsg+=(char)(msg.charAt(i)-count);
		
		count++;
	
	System.out.println(decodemsg);

static void decode()

	
	String msg="";
	String decodemsg="";
	int count=0;
	System.out.printf("%s","Input the message:");
	Scanner cin =new Scanner(System.in);
	msg=cin.nextLine();
	for(int i=0;i<msg.length();i++)
	
		if(Character.isSpace(msg.charAt(i)))
			decodemsg+=" ";
		else if(msg.charAt(i)+count>'z')
			decodemsg+=(char)(msg.charAt(i)-26+count);
			else
			decodemsg+=(char)(msg.charAt(i)+count);
		count++;
	
	System.out.println(decodemsg);