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Programming in Java Lecture 4OOP Inheritance, Abstract classes, Interfaces

Ahmed Khademzadeh

[e-mail]

Azad University of Mashhad

(Lecture powerpoint slides provided by Manu Kumar - Stanford University)

Copyright © 2003, Manu Kumar

Recap

Last time

Java Collections

Iterators

ArrayList example

OOP

Inheritance

Overriding

Polymorphism

“Pop-down” rule

Downcasting

Grad example

Copyright © 2003, Manu Kumar

Today

Continue with OOP/Inheritance

Pop-down rule

Constructors

instanceOf

Grad example

Abstract superclasses

Account example

Java Interfaces

Moodable example

Today or next time

Start Drawing/GUI

Copyright © 2003, Manu Kumar

“Pop-Down” rule

The reciever knows it’s class

The flow of control jumps around different classes

No matter where there code is executing the receiver knows its class and does the messagemethod mapping correctly for each message!

Example

Receiver is the subclass (Grad), executing a method in the superclass(Student)

A message send that Grad overrides will “pop-down” to the Grad definition as in the case of getStress() )