O-c-03: A Concrete introduction to object-oriented concepts

1. Object-oriented concepts

objects (object-oriented; OO) have not yet unified the concept, I define it here: according to people to understand the objective world of system thinking, using the concept of object-based (entity) to build a model, The method of simulating the objective world to analyze, design and implement the software. Through the object-oriented concept, the computer software system can correspond with the real-world system one by one.

2. Object-oriented programming (oriented programming-oop) is a design and programming method to solve software reuse. This method applies the similar operation logic and operation in the software system to the application of data and state, describes it in the form of the class, and reuse it in the software system by the object instance, in order to improve the efficiency of software development.

   Advantages:   greatly improve the success rate of software projects and   reduce maintenance costs

Reduced maintenance costs

   Increased portability and reliability

Four main features of object-oriented design

of abstraction

Encapsulation Polymorphism Inheritance

of abstraction

3. Object-oriented and process-oriented differences:

Process oriented:

The emphasis is on functional behavior

Focus on what steps are needed to solve the problem

Object-oriented:

Encapsulating functionality into objects, emphasizing the functionality of objects that focus on what objects are needed to solve the problem

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O-c-03: A Concrete introduction to object-oriented concepts