How do I build a JAVA or C# program which implements a DFA

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C#

Java

i need to build a JAVA or c# program which implements a DFA

my DFA shall accept a password of my choice.

my password shall be at least 8 characters long;

It must have a combination of characters (small and capital), digits, and special characters.


For example: my password can be described as follows

1- must be at least 8 characters

2- Must begin wiht the special symbol @

3- Must end with a capital letter

4 Must have at least 2 digits

What I have tried:

tried to create two dimensional array to fill the row as number of accepted character like @,digit.. etc and the column as the number of state