cryptography - Printable Version

Code:
package cryptography;

import java.util.Scanner;

public class Cryptography {

    private static int shift = 0;

    private static final char[] alphabet = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',

                                            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};

    private static final Scanner scan = new Scanner(System.in);

    public static void main(String[] args) {

        System.out.println("1. from Enlish to cryptography");

        System.out.println("2. from cryptography to English");

        String choicestr = scan.nextLine();

        int choiceint = Integer.parseInt(choicestr);

        if(choiceint == 1){

            String rawui = scan.nextLine();

            char[] ui = rawui.toCharArray();

            for(int i = 0; i < ui.length; i++){

                int number = getNumber(ui[i]) + shift;

                System.out.print(getLetter(number));

                shift++;

            }

        } else {

            String rawui = scan.nextLine();

            char[] ui = rawui.toCharArray();

            for(int i = 0; i < ui.length; i++){

                int number = getNumber(ui[i]);

                number = number - i;

                System.out.print(getLetter(number));

                shift++;

            }

            System.out.println();

        }

    }

    private static int getNumber(char letter) {

        for(int i = 0; i < 26; i++) {

            if(alphabet[i] == letter) {

                return i;

            }

        }

        return 0;

    }

    private static String getLetter(int number) {

        return "" + alphabet[number];

    }

}