Object-Oriented Programming

Object-Oriented Programming

1. Instantiation

   • Creating new object from class definition
   • Memory is allocated for object fields
   • Happens via constructor - special method which is called when object is created

2. Class

   • Characteristics
   • Behaviors
   • Property/Attribute fields

3. Encapsulation

   • combining a class with procedures and functions that manipulate it to form new data types
     • Public methods
       • Private data methods
       • Interaction Interface

4. Object

   • Constructor
     • Implicit
     • Explicit
   • Reference to object assigned to reference variable of class type

5. Inheritance

   • Define an object
   • Making hierarchy
   • Descendants inheriting access to ancestor's code and data

6. Association Aggregation

   • Two objects related to each other. Own lifecycle.
   • Aggregation: Special form form association where object has ownership of child object

7. Composition Aggregation

   • Specialized form of aggregation where a child object has no independent lifecycle. Parent connected to child
   • Sprite-Body-Arm

8. Polymorphism

   • Giving an action one name that is shared up and down object hierarchy.
   • Each object in hierarchy implementing the action in a way appropriate to itself.

9. Overriding

   • Enables child class to provide different implementation method
   • Same name, signature,and parameters
   • Handles datatypes through uniform interface
   • Generic method could be defined in parent class while child class provides specific implementation