java-Object-oriented

java-Object-oriented

1. Programming Ideas

1. Process oriented

Event-centric

Cons: Difficult to maintain, poor reusability

2. Object-oriented

Take things as the center

Advantages: Easy maintenance, good reusability

2. Basic

1. Class

Collectively, the same class of things

A carrier for encapsulating the attributes and behavior of a class of things

Function: Define the class first and then generate the object from the class

　　　　

2. Object

Object is an instance of a class

Entities in existence: static characteristics (attributes), dynamic features (methods)

3. Characteristics

1. Encapsulation defines the class (the property of the class corresponds to the property of the Thing) (the method of the class corresponds to the behavior of the thing)

2. Inheriting subclasses can automatically inherit members exposed by the parent class

3. Members of polymorphic classes have multiple forms

java-Object-oriented