What is the difference between inner class and nested class?

Polymorphism: The process of representing one form in multiple forms is known as Polymorphism. Example - Suppose if you are in a classroom that time you behave like a student, when you are in the market at that time you a like a customer, when you at your home at that time you behave like a son or daughter, Here one person present in different-different behaviors.

Inheritance in Java is a mechanism in which one object acquires all the properties and behaviors of the parent object. Using inheritance, we can create a general class that defines traits common to a set of related items. This class can then be inherited by other, more specific classes, each adding those things that are unique to it.

Java strongly supports the concept of reusability. The Java classes can be reused in several ways. Once a class has been written and tested, it can be adapted by another programmer to suit their requirements. This is basically done by creating new classes, reusing the properties of the existing ones. The logic behind inheritance in Java is that we can create new classes that from existing classes. When you inherit from an existing class, you can reuse methods and fields of the parent class, and you can add new methods and fields also. That