Oop lecture 02
Download as PPTX, PDF0 likes80 views
This document discusses key characteristics of object-oriented programming including information hiding, encapsulation, and interfaces. It notes that objects encapsulate both data and behavior, hiding implementation details from outside access. Only the object itself can manipulate its internal data. Objects provide interfaces to allow other objects to communicate through defined operations, separating the interface from the implementation. This approach simplifies models and creates a barrier against changes propagating through the system.
Oop lecture 02
- 1. Object Oriented Programming By Noor wali Khan Uoch
- 2. Characteristics of Object •Information Hiding •Information is stored within the object. •It is hidden from the outside world. •Only the object can manipulate on it. •E.g. Ali’s name is stored in his brain
- 3. Characteristics of Object •Advantages of Information Hiding •Simplifies the model by hiding the implementation details. •It is a barrier against change propagation
- 4. Characteristics of Object •Encapsulation •The data and the behavior are tightly coupled inside an object •Both the information structure and implementation details of its operations are hidden from outside world.
- 7. Encapsulation •Advantages: •Simplicity and clarity •Low complexity •Better understanding
- 8. Object has an interface •An object encapsulates data and behavior •So how does objects interacts with each other? •Each object provides an interface (operations) •Other objects communicates through this interface
- 9. Examples: Interface of car •Steer wheels •Accelerate •Change gear •Apply brakes •Turn light on/off
- 10. Separation of interface and implementation •It means change in implementation does not effect object interface. •This is achieved via principles of information hiding and encapsulation.