In Java, an overview of inner classes and the access characteristics of inner classes and the classification of inner classes (the location of inner classes)

An overview of the inner classes:
The class is defined inside another class, which is called an inner class.
　　Example: class B is defined in Class A, and Class B is called an inner class.

Access characteristics of internal classes:
　　A: Inner classes can access members of external classes directly, including private members.
　　B: external classes to access the inner class members, you must create an object of the inner class that is accessed through the objects of the inner class.

The sample code is as follows:

Classification of the inner class (the location of the inner Class):

In Java, an overview of inner classes and the access characteristics of inner classes and the classification of inner classes (the location of inner classes)