Java oops concepts

Object-Oriented Programming:

                                OOPs is a programming language using  objects and classes instead of actions and rather than logic.

                                Java is an object-oriented programming language.

OOPs concepts in java:

    1.       Object

    2.       Class

    3.       Inheritance

    4.       Encapsulation

    5.       Abstraction

    6.       Interface

    7.       Polymorphism
8.       Package

Object:

                                 An object is a software bundle of related methods and variables. The object is an instance of the class the real-world objects that you find in everyday life.

Ex: Bus,Car,Phone.

More about object

Class:
                                A class is a blueprint it has state and behavior . A class is a logical entity.

State: states means properties of class.

Behavior: Behavior means functionalities of a class.
More about class

Inheritance:
                               Acquiring features from the super-class (parent class) to subclass(child class) is known as inheritance. In  java  inheritance is achieved by using of extends keyword. Inheritance provides Code re-usability.

More about inheritance

Encapsulation:

                                A collection of similar type of data & methods are protective in a single class with required access modifiers, so that can be saved from unauthorized access.
More about encapsulation

Abstraction:                               

                                An abstraction  is a process of hiding internal details and showing only functionality is known as abstraction.

Example: Computer

More about abstraction

Interface:
                                An interface is a collection of abstract methods. It is a blueprint of a class. It contains abstract methods and final variables. By using interface 100% abstraction is achieved.

More about interface

Polymorphism:

                                One object existing in many forms is known as polymorphism. In java, there are two types of polymorphisms.

Compile time polymorphism (overloading)

Runtime polymorphism (overriding).

More about polymorphism

Package:

                                A package is a namespace it contains a group of similar types of classes, interfaces, sub-classes. To overcome naming space packages are very helpful.

More about packages

Interview Questions:

Explain about oops concepts?

What is inheritance?

What is Encapsulation?

Why we use packages?

What is an object in java?

What is polymorphism?          

What is abstraction and how we can achieve 100% abstraction in java?

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