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Object Oriented Programming using Java - OOD to OOP: ATM Case Study

Department of Computer and Information Science, School of Science, IUPUI. Object Oriented Programming using Java - OOD to OOP: ATM Case Study. Dale Roberts, Lecturer Computer Science, IUPUI E-mail: droberts@cs.iupui.edu. Starting to Program the Classes of the ATM System. Visibility

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Object Oriented Programming using Java - OOD to OOP: ATM Case Study

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  1. Department of Computer and Information Science,School of Science, IUPUI Object Oriented Programming using Java- OOD to OOP: ATM Case Study Dale Roberts, Lecturer Computer Science, IUPUI E-mail: droberts@cs.iupui.edu

  2. Starting to Program the Classes of the ATM System • Visibility • Attributes normally should be private, methods invoked by clients should be public • Visibility markers in UML • A plus sign (+) indicates public visibility • A minus sign (-) indicates private visibility • Navigability • Navigability arrows indicate in which direction an association can be traversed • Bidirectional navigability • Associations with navigability arrows at both ends or no navigability arrows at all can be traversed in either direction

  3. Fig. 8.24 | Class diagram with visibility markers.

  4. Fig. 8.25 | Class diagram with navigability arrows.

  5. Starting to Program the Classes of the ATM System (Cont.) • Implementing the ATM system from its UML design (for each class) • Declare a public class with the name in the first compartment and an empty no-argument constructor • Declare instance variables based on attributes in the second compartment • Declare references to other objects based on associations described in the class diagram • Declare the shells of the methods based on the operations in the third compartment • Use the return type void if no return type has been specified

  6. Fig. 8.24 | Class diagram with visibility markers.

  7. Outline Class for Withdrawal withdrawal.java Empty no-argument constructor

  8. Fig. 8.24 | Class diagram with visibility markers.

  9. Outline withdrawal.java Declare instance variables

  10. Fig. 8.25 | Class diagram with navigability arrows.

  11. Outline withdrawal.java Declare references to other objects

  12. Fig. 8.24 | Class diagram with visibility markers.

  13. Outline withdrawal.java Declare shell of a method with return type void

  14. Acknowledgements • Deitel, Java How to Program

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