#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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