A class can only have one object, right?

A class can only have one object, wrong. A class is a user-defined data type that can be used to describe one or more variables and objects. A class is an abstract data type, an abstraction of objects; an object is an abstraction of objective things.

A class can only have one object, that’s not right.

(Recommended learning: java introductory program)

A class is a user-defined data type that can be used to describe one or more variables , that is, the object.

Class (class) and object (object) are the collective names of two computer languages ​​​​based on computers. Objects are abstractions of objective things, and classes are abstractions of objects. A class is an abstract data type.

Their relationship is that the object is an instance of the class, and the class is the template of the object. Objects are generated through new classname and are used to call class methods and class constructors.

(Video tutorial recommendation: java video tutorial)

Define a class:

class 类名
{
    public：
    公用的数据和成员函数
    protected：
    保护的数据和成员函数
    private：
    私有的数据和成员函数
}

Declare the object:

Declare the class first type, and then define the object

Student stud1,stud2; //Student是已经声明的类类型

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