Java compilation error "No enclosing instance of type AA is accessible. must qualify the allocation with an enclosi

This is because AA is a dynamic internal class. To create such an object, an instance must correspond to it,ProgramThis error is reported when a dynamic internal class is called directly in a static method. Such errors are similar to static methods in the class. dynamic methods cannot be called directly. You can declare the internal class as static. Or do not call it in a static method.

So why can't non-static methods call dynamic methods? From an object-oriented perspective, dynamic methods are closely related to objects. For example, launching is a method, it is associated with the car object, so only the new car object can execute the car. launch