Define the features of the interface

Question

Define the features of the interface?

Answer 1

An interface is the template which contains only a signature of methods. The signature of the method contains the order of parameters, numbers of parameters and the type of parameter (value, reference, or output). It has no implementation on its own since it consist only a definition of the methods without any method body. An interface is described using a interface keyword. Furthermore, we cannot instantiate the interface.
The different features of an interface are:

i. Interface is used to execute multiple inheritances in code. This feature is somewhat different from that of abstract classes since a class cannot derive features of more than one class but can easily apply multiple interfaces.

ii. Interface defines a particular set of the methods and their arguments.

iii. Variables in interface should be declared as static, public and final but methods should be public and abstract.

iv. The class implementing the interface should implement all of its methods.

v. The interface can derive from more than one interface.