This document provides an overview of a seminar on core Java concepts submitted for a bachelor's degree. It includes sections on what Java is, its features, and main object-oriented programming concepts in Java like objects, classes, inheritance, encapsulation, polymorphism, and abstraction. It also includes an example "Hello World" Java program.

1. A
SEMINAR
On
CORE JAVA
Submitted In Partial fulfillment For the award of the Degree of
Bachelor of Technology
In
Computer Science Engineering
SESSION: 2020-21
Submitted to:- Submitted by
Mr. Sanjay Tiwari Arpit khandelwal
Head of Department Roll No.: 17EAOCS008
DEPARTMENT OF COMPUTER SCIENCE ENGINEERING
ARYA INSTITUTE OF ENGINEERING TECHNOLOGY AND MANAGEMENT
OMAXE CITY, BAD KE BALAJI, AJMER ROAD, JAIPUR, RAJASTHAN

2. CONTENTS
• What is Java ?
• Features of Java
• OOPS Concept of Java
• Program

3. WHAT IS JAVA?
• Java is a general purpose programming
language which is use to create various
applications.
• Java was first created is 1990 by James
Gosling and his team in Sun Microsystems.
• Java was first known as Oak. Later it was
known as Green project, finally in year 1996 it
got it’s name Java.

4. FEATURES OF JAVA
• It is simple.
• Object-oriented, and
familiar.
• It is robust.
• Platfrom independent.
• Secure.
• It is portable.

5. MAIN CONCEPTS
• Object
• Class
• Inheritance
• Encapsulation
• Polymorphism
• Abstraction

6. OBJECT
• An object has identity
(each object is a
distinct individual).
• An object has state
(it has various properties,
which might change).
• An object has behaviour
(it can do things and can
have things done to it).

7. CLASS
• A class is a user defined blueprint or prototype from
which objects are created.
• It represent the set of properties or methods that are
common to all objects of one type.
• In general ,class declartions can include these
components ,in order:
 Modifiers
 Class Name
 Super class (If Any)
 Interface(If Any)
 Body

8. • Modifiers:- A class can be public or has default
access.
• Class name:- The name should be begin with
Initial Letter.
• Super class(If any):-The name of the class's
parent (Superclass ),if any preceded by the
keyword EXTENDS.
• Interface:- A comma-separated list of interface
implemented by the class ,if any,preceded by the
keyword IMPLEMENTS. A class can implement
more than one interface.
• Body:- The class body surrounded by braces{ }

9. INHERITANCE
• Inheritance is a mechanism in which one object acquires all the
properties and behaviours of a parent object.
• Hence, inheritance facilitates Reusability and is an
important concept of OOPs.
• The idea behind Inheritance in java is that you can create new
classes that are built upon existing classes.
TYPES OF INHERITANCE :
Single Inheritance
Multi -Level Inheritance
Hierarchial Inheritance

10. ENCAPSULATION
• Encapsulation is a mechanism of
wrapping the data(Variable)and
methods togeather in a single unit.
• To achieve encapsulation in java
declare the variable of a class as
private.
• Encapsulation= Abstraction+ Data
hiding

11. POLYMORPHISM
• The process of representing one
form in multiple forms is known
as Polymorphism
• Polymorphism principal is divided
into two sub part they are:
 Compile Time Polymorphism
 Run Time Polymorphism

12. Over loading vs Overriding

13. ABSTRACTION
• Abstraction is a process of
hiding the implementation
details from the user, only the
functionally will be provided to
the user.
• In other words the user will
have the information on what
the object does instead of how
it does it.

14. PROGRAM:
HELLO WORLD
class Hello
{
public static void main(String[] args)
{
System.out.println(“Hello.World”);
}
}
C:javac Hello.java
C:java Hello
( compilation creates Hello.class )
(Execution on the local JVM)