public class JavaProject
{

    public static String Original;

    public static void main(String args[])  // Patrick
    {
        System.out.println("This is a program that encrypts or decrypts your input word or phrase.\n It uses the autokey cipher, with a key letter 'N'.");
        System.out.println("");
        System.out.println("Enter a word or phrase");
        Original=Expo.enterString();
        Original.toUpperCase();
        JavaProject.Choose();
    }


    public static void Choose () //
    {
        System.out.println("");
        System.out.println("Do you want to encrypt or decrypt?");
        String choice = Expo.enterString();
        System.out.println();
        if(choice.equals("encrypt")) {
            JavaProject.Encrypt();  }
        else if (choice.equals("decrypt")) {
            JavaProject.Decrypt();  }
        else {System.out.println("Invalid response. Please use either 'encrypt' or 'decrypt'.");
            JavaProject.Choose();
        }
    }

    public static void Encrypt () //
    {

        char[] x;
        x = Original.toCharArray();
        char c = 'N';
        x[0] += (26-c);
        if (c>'Z') {
            c-=26;
        }
/*      String a = Original.replace('a','n');
        String b = a.replace('b','o');
        String c = b.replace('c','p');
        String d = c.replace('d','q');
        String e = d.replace('e','r');
        String f = e.replace('f','s');
        String g = f.replace('g','t');
        String h = g.replace('h','u');
        String i = h.replace('i','v');
        String j = i.replace('j','w');
        String k = j.replace('k','x');
        String l = k.replace('l','y');
        String m = l.replace('m','z');
        String n = m.replace('n','a');
        String o = n.replace('o','b');
        String p = o.replace('p','c');
        String q = p.replace('q','d');
        String r = q.replace('r','e');
        String s = r.replace('s','f');
        String t = s.replace('t','g');
        String u = t.replace('u','h');
        String v = u.replace('v','i');
        String w = v.replace('w','j');
        String x = w.replace('x','k');
        String y = x.replace('y','l');
        String encoded = y.replace('z','m');
        System.out.println(encoded);               */
    }

    public static void Decrypt ()  //
    {
        char[] x;
        x = Original.toCharArray();
        char c = 'N';
        x[0] += (26-c);
        if (c>'Z') {
            c-=26;
        }
 /*     String a1 = Original.replace('n','a');
        String b1 = a1.replace('o','b');
        String c1 = b1.replace('p','c');
        String d1 = c1.replace('q','d');
        String e1 = d1.replace('r','e');
        String f1 = e1.replace('s','f');
        String g1 = f1.replace('t','g');
        String h1 = g1.replace('u','h');
        String i1 = h1.replace('v','i');
        String j1 = i1.replace('w','j');
        String k1 = j1.replace('x','k');
        String l1 = k1.replace('y','l');
        String m1 = l1.replace('z','m');
        String n1 = m1.replace('a','n');
        String o1 = n1.replace('b','o');
        String p1 = o1.replace('c','p');
        String q1 = p1.replace('d','q');
        String r1 = q1.replace('e','r');
        String s1 = r1.replace('f','s');
        String t1 = s1.replace('g','t');
        String u1 = t1.replace('h','u');
        String v1 = u1.replace('i','v');
        String w1 = v1.replace('j','w');
        String x1 = w1.replace('k','x');
        String y1 = x1.replace('l','y');
        String decoded = y1.replace('m','z');
        System.out.println(decoded);             */
    }

}