Soft Eng: Modules Design (min 500 words)

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A bank must report
to the government’s tax institution all transactions (deposits and
withdrawals) that exceed $10,000. Building on the initial design of
the banking system from question 22, use the Observer design
pattern to construct a class that monitors all Account
transactions.

Consider a simplified OO design, shown in Figure, for
a banking system. Accounts can be created at the bank, money can be
deposited and withdrawn from the account. An account is accessed by
its account number. Use the Decorator design pattern to add two new
banking features to the design:
(a) Overdraft protection: allows the customer to withdraw money
when the account balance is zero; total amount that can be
withdrawn in this feature is a predefined credit limit.
(b) Transaction fee: charges the customer a fixed fee for each
deposit and withdrawal transaction.

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