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Interface

An interface is a specification and a collection of functions.

The function name is defined in the interface and implemented in the subclass, which separates the definition and implementation of the function and reduces the coupling of the program.

Abstract classes:

Extract the same method name from the normal class, but the specific method implementation is different. In this case, an abstract class can be defined.

Abstract class he defines the abstraction of a class of things. Whether there is a relationship between an abstract class and a subclass, and whether there is a relationship between an interface and its subclasses, if one inherits an abstract class, it must be the type of abstract class, and the implementation of the interface represents the relationship between whether it has or not. For example, whether birds can fly (have the characteristics of flying), if the flight interface is implemented, it means that they have flight characteristics, otherwise they do not have them.

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