Describe OOPs concepts in Java

The four main concepts are involved in OOP:

Abstraction
Encapsulation
Inheritance
Polymorphism

Abstraction
Abstraction is hiding of information from others. In case of Java, its hiding implementation of a method/ object. For example if an interface is available to outer world, so end user won’t know about implementing class details. This is just a kind of abstraction. Abstraction could be anywhere in java, wherever we hide some information, we call it abstraction.

Encapsulation
Encapsulation is combining data and method along with implementation hiding within the class. Implementation hiding is done with the help of access modifiers (public, protected, package, private).

Inheritance
Inheritance is the capability of a class to use the properties and methods of another class while adding its own functionality. Although inheritance may sometimes imply (especially in Java, where the keyword for inheritance is extends) that you are going to add new methods to the interface, that’s not necessarily true. The second and more important way to differentiate your new class is to change the behavior of an existing base-class method. This is referred to as overriding that method.

Polymorphism
Polymorphism is something like one name many forms. Polymorphism is also known as dynamic binding or late binding or run-time binding.

October 31, 2008 | Filed Under Java