C # Introduction-class and object selected from "C # programming language details" and sent to the novice

Class is the most basic type in C. A class is a data structure that combines state (field) and behavior (methods and other function members) in a unit. Class provides definitions for dynamically creating class instances, that is, objects ). Classes support inheritance and polymorphism (polymorphism), that is, the mechanisms by which derived classes can expand and specialize base classes.
You can use the class declaration to create a new class. A class declaration starts with a declaration header. Its composition is as follows: first, it specifies the features and modifiers of the class, followed by the class name and the name of the base class (if any, and the name of the interface implemented by this class. The declaration header is followed by a class body, which consists of a group of member declarations contained in braces.
The following is a declaration of a simple class named Point:
Public class Point
{
Public int x, y;

Public Point (int x, int y ){
This. x = x;
This. y = y;
}
}
Create a class instance using the new operator. It allocates memory for the new instance, calls the constructor to initialize the instance, and returns a reference to the instance. The following statement creates two Point objects and saves the references of those objects to two variables:
Point p1 = new Point (0, 0 );
Point p2 = new Point (10, 20 );
When an object is no longer used, the memory occupied by the object will be automatically recycled. In C #, it is neither necessary nor possible to explicitly release the object.
1.6.1 member
Class, static member, or instance member ). Static members belong to the class, and instance members belong to the object (class instance ).
Table 1.6 provides descriptions of the various members that a class can contain.
Table 1.6 class members
Members
Description

Constant
Constant value associated with the class

Field
Class variables

Method
Computing and behavior that can be executed by class

Attribute
Enable the object to read and write the class name attributes.

Indexer
Allows objects to be indexed in the same way as arrays.

Event
Notifications that can be generated by classes

Operator
Class support conversion and expression operators