#66 Need of Interface in Java

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In this lecture we will learn:
– Methods in java
– What is an interface?
– Need for an interface

#1
– We can also pass an object as a parameter in a method.
– When you build an application, you need to make it more flexible.
– We can create a reference of the parent class and an object of the sub-class.
– Passing reference and the reference of an object that you accept in a method, both should be the same.

#2
Interface:-
– Interface in Java is used to achieve abstraction.
– Interface is used to design an application to make it loosely coupled.
– implements keyword is used with a class to extend it to an interface
interface Computer
{
}
………
class Desktop implements Computer
{
statement;
}

#3
Need of an Interface:-
– It is used to implement abstraction.
– We can also achieve multiple inheritance in Java, by using the interface.
– Any class can extend only 1 class but can any class implement an infinite number of interface.
– It is also used to achieve loose coupling.

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