Java™ How to Program, Seventh Edition

M.2. Class ATM

Class ATM (Fig. M.1) represents the ATM as a whole. Lines 6–12 implement the class’s attributes. We determine all but one of these attributes from the UML class diagrams of Figs. 10.21 and 10.22. Note that we implement the UML Boolean attribute user-Authenticated in Fig. 10.22 as a boolean attribute in Java (line 6). Line 7 declares an attribute not found in our UML design—an int attribute currentAccountNumber that keeps track of the account number of the current authenticated user. We will soon see how the class uses this attribute. Lines 8–12 declare reference-type attributes corresponding to the ATM class’s associations modeled in the class diagram of Fig. 10.21. These attributes allow the ATM to access its parts (i.e., its ...