Visual Basic 2005 for Programmers: Deitel Developer Series, Second Edition

J.10. Class BalanceInquiry

Class BalanceInquiry (Fig. J.9) inherits from Transaction (line 4) and represents an ATM balance inquiry transaction. BalanceInquiry does not have any attributes of its own, but it inherits Transaction attributes accountNumber, screen and bankDatabase, which are accessible through Transaction’s Public ReadOnly properties. The BalanceInquiry constructor (lines 7–10) takes arguments corresponding to these attributes and simply forwards them to Transaction’s constructor using MyBase.New (line 9).

Figure J.9. Class BalanceInquiry represents a balance inquiry ATM transaction.

1 ' BalanceInquiry.vb 2 ' Represents a balance inquiry ATM transaction 3 Public Class BalanceInquiry 4 Inherits Transaction 5 6 ' BalanceInquiry constructor ...