Class Hierarchy
  This class must extend the FixedTermSavingsAccount
  class.
  
Methods
This class must contain the following methods. It may contain other methods as well.
Constructors:
The getAccountID Method:
getAccountID
  that has no parameters and returns an int.  The return
  value should be 20000 plus the account number.
  The withdraw Method:
withdraw
  that is passed a double (the amount of the withdrawal)
  and does not return anything.
  If the value of the parameter is negative this method should do nothing. In addition, if the value of this parameter exceeds the balance this method should do nothing. Otherwise, it should reduce the balance by the value of the parameter.
Copyright 2010