Java is based on the concept of object-oriented programming. As the name suggests, at the center of it all is an object. Objects contain both data and the functionality that operates on that data. This is controlled by the following four paradigms.

As we all know Object Oriented Programming Concepts are very important. Without having an idea about OOPS concepts, you will not be able to design systems in the object-oriented programming model. It simplifies software development and maintenance. This PDF explained core OOPs concepts:

• OOP uses an approach of treating a real world agent as an object. • Object-oriented programming organizes a program around its data (that is, objects) and a set of well-defined interfaces to that data. • An object-oriented program can be characterized as data controlling access to code by switching the controlling entity to data.

• Explain what Object Oriented Programming is, • Describe the benefits of the Object Oriented programming approach and • Understand and the basic concepts of abstraction, encapsulation, generalisation and polymorphism on which object oriented programming relies.

Object-oriented programming (OOP) is a programming paradigm based on the concept of “objects”, which may contain data, in the form of fields, often known as attributes; and code, in the form of procedures, often known as methods.

1. A competence to design, write, compile, test and execute straight forward programs using a high level language; 2. An appreciation of the principles of object oriented programming; 3. Be able to implement, compile, test and run Java programs comprising more than one class, to address a particular software problem. 4.

Java OOPs Concepts Object means a real word entity such as pen, chair, table etc. Object-Oriented Programming is a methodology or paradigm to design a program using classes and objects. It simplifies the software development and maintenance by providing some concepts: o Object o Class o Inheritance o Polymorphism

you will walk through object-oriented programming by example; learning to use a simple object, examining the definition, extending the definition, and then designing your own object. Finally, you will explore the most important concepts in object-oriented programming: encapsulation, data hiding, messages, and inheritance.

• OOP is a programming methodology that helps organizing complex programs through the use of the three principles –Encapsulation, Polymorphism and Inheritance. • OOP enables you to consider a real-world entity as an object. • OOP combines user-defined data and instructions into a single entity called an Object.

object is defined by a set of methods (functions), which may access or manipulate the state. Book is a special method, called the constructor of the class; used to create and initialize instances (objects). constructor is a special method which initializes an object immediately upon creation.