Object:
- Objects in the general sense: the real world is a thing actually exists
- Object The object oriented methodology: objective reality is a physical description of the system used
Abstract and classification:
- Classification is based on the principle: Abstract
- Abstract common attributes and behavior of objects of the same class to form class
- Class relationship with the object:
- Examples of the type of relationship
Package:
- Internal details hidden objects
- Foreign forming a boundary
- Retaining only limited external interface
- Easy to use, good security
inherit:
- Significance of software reuse
- Renovation, expansion of existing classes form a new class
Polymorphic:
- The same message may cause a different effect on the behavior of different objects