Java OOP

OOP

OOP Concepts

Encapsulation

• Usually has 2 meanings in OOP
  1. Bundling of behavior and attributes on a single object
  2. The practice of hiding fields and methods from public access
• Why would we want to hide things?
  • to make interface simplier
  • hide unnecessary details
  • protect integrity of data on an object

Inheritance

• 
• Defines a is a relationship
• As a form of code re-use
• a way to organize classes into a parent-child hierarchy, which lets the child inherit (re-use), fields, methods from it’s parent
• A CHILD CAN ONLY HAVE 1 DIRECT PARENT THAT IT INHERITS FROM IN JAVA

Polymorphism

• simply means many forms
• makes code simpler
• it encourages code extensibility

Composition

• defines a has a relationship
• more flexible than inheritence
  • you can add and remove composition components without the risk of breaking all of the subclasses that are inherited from like inheritence
• 

Abstraction