In Interface only one specifier is used- Public. The access specifiers used with classes are private, protected, and public. The interface cannot contain concrete(with implementation) methods In an interface, you canвЂ™t instantiate variables and create an object.Д¬lass can contain concrete(with implementation) methods In class, you can instantiate variables and create an object. The major differences between a class and an interface are: S. The reason is, abstract classes may contain non-final variables, whereas variables in the interface are final, public and static. So the question arises why use interfaces when we have abstract classes?

Interfaces are used to implement abstraction.

It is also used to achieve loose coupling.

Since java does not support multiple inheritances in the case of class, by using an interface it can achieve multiple inheritances.

It is used to achieve total abstraction.

To implement interface use implements keyword. A class that implements an interface must implement all the methods declared in the interface. That means all the methods in an interface are declared with an empty body and are public and all fields are public, static, and final by default.

To declare an interface, use the interface keyword. If a class implements this interface, then it can be used to sort a collection.

A Java library example is Comparator Interface.

If a class implements an interface and does not provide method bodies for all functions specified in the interface, then the class must be declared abstract.

So it specifies a set of methods that the class has to implement.

An Interface is about capabilities like a Player may be an interface and any class implementing Player must be able to (or must implement) move().

Interfaces specify what a class must do and not how.

Like a class, an interface can have methods and variables, but the methods declared in an interface are by default abstract (only method signature, no body).

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