Interfaces in Java Interface encourages abstraction (implementation not provided) and loose coupling, and allows multiple different types to be used interchangeably via the interface . Through interfaces , we can get polymorphism: as we can call interface methods on an object without knowing its concrete class, as long as it implements the interface . Usage of Interface in Java For achieving full data abstraction Using Interface , you can use the concept of multiple inheritances Interfaces can also be used to achieve loose coupling Properties of Interfaces in Java Interfaces are implicitly abstract Every method within an interface is also implicitly abstract For the above reason, they do not need to be declared abstract All methods of an interface are implicitly public Defining Interface An interface is defined much like a class. The ... Learn what interfaces are in Java , how they are used to achieve abstraction, polymorphism, and multiple inheritances, and what methods and variables they can contain. See examples of interface inheritance, default methods, functional interfaces, and more. An Interface in Java is an abstract type that defines a set of methods a class must implement.
