Withdraw
accountnumber:amount:
excute()
Bank Account
account number:pin:
validpin()getbalance()credit()debit()
cash dispenser
count:match:
releasecash()
Deposit
Deposit Slot
accept cash()
Screen
displaymessage()
ATM
authentication()
Bank detabase
getbalance()credit()debit()
Keypad
getinput()
Balance Inquiry
account number：
excute()
