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Object Oriented Programming using Java - Composition

Department of Computer and Information Science, School of Science, IUPUI. Object Oriented Programming using Java - Composition. Dale Roberts, Lecturer Computer Science, IUPUI E-mail: droberts@cs.iupui.edu. Composition. Composition

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Object Oriented Programming using Java - Composition

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

  2. Composition • Composition • A class can have references to objects of other classes as members • Sometimes referred to as a has-arelationship • One form of software reuse is composition, in which a class has as members references to objects of other classes.

  3. Outline • Date.java • (1 of 3)

  4. Outline Validates month value • Date.java • (2 of 3) Validates day value

  5. Outline • Date.java • (3 of 3) Check if the day is February 29 on a leap year

  6. Outline Employee contains references to two Date objects • Employee.java Implicit calls to hireDate and birthDate’s toString methods

  7. Outline • EmployeeTest.java Create an Employee object Display the Employee object

  8. Acknowledgements • Deitel, Java How to Program

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