It provides total abstraction means all the methods in an interface are declared with the empty body, and all the fields are public, static and final by default. It can be used to achieve loose coupling.Īn interface is declared by using the interface keyword.By interface, we can support the functionality of multiple inheritance. Polymorphism is the ability of an object to take on many forms.There are mainly three reasons to use interface. Since Java 9, we can have private methods in an interface. Since Java 8, we can have default and static methods in an interface. It cannot be instantiated just like the abstract class.
same concept goes with programming, An object can exist in many forms. Since Java supports polymorphism, it is an Object-Oriented Language. Well in biology Polymorphism is the ability of an organism or specie can have many different forms or stages. So, languages that do not support polymorphism are not ‘Object-Oriented Languages’, but ‘Object-Based Languages’. In the above figure, you can see, Man is only one, but he takes multiple roles like he is a dad to his child, he is an employee, a salesperson and many more. Java Interface also represents the IS-A relationship. What is Polymorphism in Java Polymorphism in Java is the task that performs a single action in different ways. Polymorphism encourages called as ‘extendibility’ which means an object or a class can have it’s uses extended. In other words, you can say that interfaces can have abstract methods and variables. It is used to achieve abstraction and multiple inheritance in Java. When you create a new type of object, you dont need to change the framework to accommodate the new object type, as long as it follows the 'rules' of the object.
There can be only abstract methods in the Java interface, not method body. The reason why you use polymorphism is when you build generic frameworks that take a whole bunch of different objects with the same interface. On the surface, this looks similar to the templates in C++, but in reality, it is quite different in many aspects. The interface in Java is a mechanism to achieve abstraction. Java, starting with version 5.0, has a feature called 'parametric polymorphism', or 'generics'. It has static constants and abstract methods. This is an important aspect of polymorphism in an. Why multiple inheritance is supported in Interface while it is not supported in case of class.Īn interface in Java is a blueprint of a class. Similarly, any method accepting an Animal object would accept an instance of a Cat or any Mammal type as well.
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