Chapter 10 Thinking in Objects

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Presentation transcript:

Chapter 10 Thinking in Objects

Principle of OOP Inheritance Abstraction Encapsulation Polymorphism Also know as (APIE)

Inheritance and Composition A class can extend another class. Inheritance implements the “ IS a” relationship between objects A class can implements interface, methods members from its parent class.

Inheritance and Composition Is- A and Has –A Inheritance VS Composition Favor Composition Polymorphism Interfaces

Is-A and Has-A relationship Classes depend on another class Classes are related via Is –A or Has –A relationship Cat-> Animal = IS-A Car->Wheel, Engine =Has -A Train->Wheel,Engine=Has -A Car,Truck-> Vehicle= Is-A HAS-A=Composition (compose) IS-A=Inheritance(subtype) Reuse code

Inheritance (Is-A) Animal Cat Animal is a base class cat class inheritances from animal Animal Cat

Inheritance Syntax Java Supports only public inheritance A is a Superclass and B is a Subclass

Inheritance Syntax In order to call the constructor of superclass(A) the keyword super is used

Composition (Has-A) car wheel Engine Something is made up of other parts Car contains wheel and engine It is also called aggregation car wheel Engine

Composition (Has-A):aggregation Composition(HAS-A) simply mean use of instance variables that are references to other objects. For example: Maruti has Engine, or House has Bathroom

Composition (Has-A):aggregation

Aggregation Lab

Inheritance Lab Follow the instructions provided on Lab9