What is instantiation OOP? code example

Example 1: What is instantiation OOP?

Instantiation means you creating an object of that class.

There are some cases where you don’t want that your class’ instance will be created.

Now, you may have doubt that Why do I don’t want to create an object of that class?

So here are some reasons:

A class contains only static methods or it is final. i.e. Math class in Java
A class contains an abstract method(s) which means implementation of the method 
is not done. Now if you don’t have any implementation(logic) is done then there 
is no meaning of using that method. So If you create an object and then call 
that method. It is useless. That’s why it is not possible to instantiate an 
abstract class.

Example 2: What is instantiation OOP?

It is the creation of a new instance of an object, with respect to OOP.

Suppose we have a programming class called “Dog”. To instantiate this class we create a new object of type Dog. We would do something like this:

// this is instantiation 
Dog myDog = new Dog(); 
// set properties of the dog 
myDog.setName(“Fido”); 
myDog.setAge(3); 
myDog.setBreed(“Airedale”); 
// other instantiation methods, if the constructor is overloaded 
Dog bigDog = new Dog(“Rover”, 4, “Great Dane”);