1. 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

2. Composition Composition
A class can have references to objects of other classes as members
Sometimes referred to as a has-a relationship
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 Check if the day is February 29 on a leap year
(3 of 3)
Check if the day is February 29 on a leap year

6. Outline Employee.java Employee contains references to two Date objects
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