simple brute force code to crack AES

hi
I should write a code to break AES encryption. I have the key in file
but its not complete so i have to guess the missing right most 16-bits
out of 128-bits. I don't know how to treat the key at the level of bit
where i get it as SecretKey. This is my code:

ObjectInputStream in = new ObjectInputStream(new
FileInputStream("SecretKey.ser"));
SecretKey key = (SecretKey)in.readObject();
byte[] raw = key.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");

how can i make a for loop to move over all possible key values.

please help.