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Asked by Chhavi Kumar Last Modified
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In Java, an interface is a blueprint of a class that defines a set of methods (and constants) that other classes must implement. It establishes a contract for what methods a class should contain without specifying the implementation details.
Interfaces declare methods without providing their definitions; they only contain method signatures (method name, parameters, return type) and constant declarations. Any class that implements an interface must provide concrete implementations for all the methods defined in the interface.
This concept enables multiple classes to adhere to a specific interface while implementing methods in their unique way. It promotes code reusability, allows for multiple inheritances (as Java doesn't support multiple class inheritance), and facilitates polymorphism by allowing different objects to be treated through a common interface.
For example, an interface Shape might declare methods like calculateArea() and draw(). Different classes such as Circle, Square, and Triangle can implement the Shape interface with their respective implementations of these methods while ensuring they adhere to the contract specified by the interface.
The interface in Java is a mechanism to achieve abstraction. There can be only abstract methods in the Java interface, not the method body. It is used to achieve abstraction and multiple inheritances in Java using Interface. In other words, you can say that interfaces can have abstract methods and variables. It cannot have a method body. Java Interface also represents the IS-A relationship.
When we decide on a type of entity by its behavior and not via attribute we should define it as an interface.
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