-How do you programmatically calculate the number of possibilities of stairs when you have n steps and some of them could be single steps and some of them could be double steps? -What's the difference between final and finally in Java? -What data structure would you use to implement a phone book -How would you write a hash table retrieval function to get the phone number of a person given their name and postal code. One postal code could be associate with multiple phone numbers, and one name could be associated with multiple phone numbers.
