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This article introduces the knowledge of "what is the role of java empty interface". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The operating environment of this tutorial: windows7 system, java10 version, DELL G3 computer.

1. General interfaces, including abstract methods.

2. They are all constant.

Do not add any decorations to the interface category (public is not required either).

Because any fields (member variables) in the interface are automatic by static and final, the interface becomes a very convenient tool for creating constant groups.

Public interface Months {int JANUARY = 1, FEBURARY = 2,..., DECEMBER = 12;}

3. An empty interface is also called a tagged interface, and its functions are as follows:

Used as a mark.

Logically, you can make a class a subclass of an interface.

/ / null interfacepublic interface EnvironmentObject {} / / public interface Agent extends EnvironmentObject {....}

Some methods that we usually use are stored in the interface. In order to call the method more quickly in the program, we will choose to put the method in the interface. This article mainly explores the types of interfaces in java.

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