Unable To Implement Alphanumeric Security Code

I have been trying to implement a alphanumeric security code in JAVA. Here are my specifications:

1) Numbers and letters
2) There is user input
3) In the format of NNN-LL-NNNN where N=Numbers and L=UPPERCASE letters
4) If it is incorrect print out INVALID CODE
5) If it is correct print out VALID CODE

Here is what I have produced so far...

import java.util.*;
import java.io.*;
//Class Declaration
class WorkingWithStrings
{
//Main Method
public static void main(String[] args)
{
//Takes input from user

[Code]...

I have taking the approach of invoking a separate method that will check the validity of the security code. However I am having an issue with creating a statement that checks if the middle two characters of the security code are capital letters. This could possibly tie in with my understanding of strings.