The class that implements interface must implement all the methods of that interface. Since methods in interfaces do not have body, they have to be implemented by the class before you can access them. What is the use of interface in Java?Īs mentioned above they are used for full abstraction. We will cover this in detail, later in this guide. Also, the variables declared in an interface are public, static & final by default. An interface can have methods and variables just like the class but the methods declared in interface are by default abstract (only method signature, no body, see: Java abstract method). Interface looks like a class but it is not a class. In this guide, we will cover what is an interface in java, why we use it and what are rules that we must follow while using interfaces in Java Programming. Abstraction is a process where you show only “relevant” data and “hide” unnecessary details of an object from the user(See: Abstraction). Unlike abstract class an interface is used for full abstraction. ![]() In the last tutorial we discussed abstract class which is used for achieving partial abstraction.
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