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Object-Oriented Programming using Java: Composition Concepts

Learn about composition in Java programming, where classes can have references to objects of other classes as members. This course covers date validation, employee references, and implicit method calls.

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Object-Oriented Programming using Java: Composition Concepts

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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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