How to define an interface in java

Definition of interface:

public interface  usb{}

Keyword interface;

Implement interface:

public class Computor implements  usb{}

Keyword to implement interface: implements ;

Example:

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The methods in the interface are Abstract method, so public abstract can be omitted. All variables are constants and must be assigned values. The default public abstract final int a=0;

There can be multiple interfaces Inheritance, a class can implement multiple interfaces. The interface also has a function for decoupling. The interface is a special abstract class. All access modifiers between interfaces are public, and all methods are abstract methods. All variables are constants;

A class implements an interface and must implement all methods in the interface;

Example:

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