Importance of Interfaces 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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