object
An object is a specific object, such as "table" is not an object, and "this table" is an object
Properties: Each property of each object has a specific value.
Attributes: gender, first name
Methods: The behavior, actions, operations performed by an object.
Method: eat, sleep
class definition
Classes are abstract concepts, just templates, eg: "human"
[Access modifier] class class name
{
member;
}
public class Person //This is a class, which can contain variable definitions or methods
{
}
A class can contain variable definitions or methods
There are four types of access modifiers commonly used
private: private members, which can only be accessed inside the class.
protected: protected members, accessible within this class and in inherited classes.
pubilc: public member, full disclosure, no access restrictions.
internal: The current assembly can be accessed.
instantiation of the class
keyword new syntax class instance name=new class()
Class member access instancename.property instancename.method
Tivket t = new Tivket;
Attributes
Attribute definition: get; set;
Attributes are used to protect the fields corresponding to them. Ensure that the reading and assignment of fields meet the requirements.
Attributes can be divided into: read-write, read-only, write-only
//Attributes
public string Name
{
get { return _name; }//读
set { _name = value; }//写
}
Constructor
Write a class first, and then write a method in the class. The method name is the class name.
Write a class, if you don't write any constructor, then this class has a default no-argument constructor.
public Tivket(int distance)
{
if (distance <0)
{
distance = 0;
}
this._distance =distance ;
}