CaesarCipher2

gistfile1.txt

import java.util.*;

public class CaesarCipher
{

    String message; 
    int key;
    Scanner sc = new Scanner(System.in);
    String encoded = "";
    char c;

    public CaesarCipher(){
        System.out.println("Press 1 to encrypt, press 2 to decrypt with a key, press 3 to brute force.");

        key = sc.nextInt();

        if(key == 1){
            System.out.println("Please enter the message to be encrypted.");   
            sc.nextLine();
            message = sc.nextLine();
            System.out.println("How much would you like to shift the message?");
            key = sc.nextInt();
            encryptMessage(message, key);
        }else if(key == 2){
            System.out.println("Please enter the message to be decrypted.");
            sc.nextLine();
            message = sc.nextLine();
            System.out.println("How much did they shift their message?");
            key =  -1 * sc.nextInt();
            encryptMessage(message, key);
        }else if(key == 3){
            System.out.println("Please enter the encrypted text.");
            sc.nextLine();
            message = sc.nextLine();
            for(int i = 1; i < 26; i ++){
                encryptMessage(message, -i);
            }
        }
    } 
    //A = 65
    //a = 97
    public void encryptMessage(String input, int key){

        for(int i = 0; i < input.length(); i++){
            c = input.charAt(i);
            encoded += (char)((c + key) % 128);
        }

        System.out.println(key + " " + encoded);
        encoded = "";
    }

}