State the features of an interface

An interface is a template that solely includes method signatures. The number of arguments, the kind of parameter (value, reference, or output), and the sequence of parameters make up a method’s signature. Because it simply includes the specification of methods and no method body, an interface has no implementation on its own. The interface keyword is used to define an interface. Furthermore, you are unable to create an interface. The following are some of the features of an interface:

  • An interface is used to implement multiple inheritances in code. This feature of an interface is quite different from that of abstract classes because a class cannot derive the features of more than one class but can easily implement multiple interfaces.
  • It defines a specific set of methods and their arguments.
  • Variables in an interface must be declared as public, static, and final while methods must be public and abstract.
  • A class implementing an interface must implement all of its methods.
  • An interface can derive from more than one interface.