Java program for four square encryption

Its a four square encryption program with two input keys.

Enter the keys and then enter whether encrypt or decrypt then enter the plain text or cipher text respectively.

I used a different 6x6 format which includes all letters and numbers.

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 1 2 3 4

5 6 7 8 9 0