What Is Java | Java Tutorial | Java Programming | Learn Java | Edureka

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What is Hadoop?

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Agenda For Today
➢ What is Java?
➢ Where is Java used?
➢ Features of Java
➢ Java Environment
➢ How does Java work?
➢ Data Types in Java
➢ Operators in Java
➢ Functions in Java
➢ Object Oriented Concepts in Java

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What is Java?

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What is Java?
➢ Java was created by a team lead by James Gosling in 1995 for Sun Microsystems.
➢ Java is a platform independent programming language that follows the logic of
“Write once, Run anywhere”.
Programming Language Operations Platform

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What is Java?
January 1996
February 1997
December 1998
May 2000
February 2002
September 2004
December 2006
July 2011
March 2014
Java 1.0
Oak
Java 1.1
Java 1.2
Playground
Java1.3
Kestrel
Java 1.4
Merlin
Java 5 Tiger
Java 6
Mustang
Java 7
Dolphin
Java 8

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Android is the markets leading mobile operating system that extensively uses Java.
Where is Java used?

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Below are some of the domains that make use of Java:
Where is Java used?
Financial
Services
Scientific
Research
Retail
Information
Technology
Android
Stock
market
Banking Big Data

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Features of Java
Distributed RobustDynamic High Performance
Simple Object-oriented
{OOPS}
Portable Secure

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Features of Java
Simple Object-oriented
{OOPS}
DiPortable Secure
➢ Java was designed to be easy for professional programmer to learn and use effectively.
➢ No need to worry about memory management because there is Automatic Garbage Collection
in java.

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Features of Java
Object-oriented
{OOPS}
DistributedPortable Secure Dyna
➢ Applications written using Java are portable in the sense that they can be executed on any kind
of computer containing any CPU or any operating system.

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Features of Java
Object-oriented
{OOPS}
Distributed RobSecure Dynamic
➢ Java is true object oriented language.
➢ Everything is considered to be an “object” and all operations are performed using these
objects.

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Features of Java
Distributed RobustSecure Dynamic High P
➢ Java Programs run inside virtual machine sandbox to prevents any activities from untrusted
sources.
➢ No use of explicit pointer.

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Features of Java
➢ Java has a feature called Remote Method Invocation (RMI) using which a program can invoke
method of another program across a network and get the output.

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Features of Java
➢ Java programs carry with them substantial amounts of run-time type information that is used
to verify and resolve accesses to objects at run time.

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Features of Java
➢ Java checks the code during the compilation time and run time also.
➢ Java completely takes care of memory allocation and releasing, which makes the Java program
more robust.

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Features of Java
➢ Java achieves high performance through the use of bytecode which can easily translated into
native machine code.

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Java Development Kit
JDK
JRE
JVM
JVM (Java Virtual Machine) is an abstract machine. It is
a specification that provides runtime environment in
which java bytecode can be executed.
JRE (Java Runtime Environment) is a runtime
environment which implements JVM and provides all
class libraries and other files that JVM uses at
runtime.
JDK(Java Development Kit) is the tool necessary to
compile, document and package Java programs. The
JDK completely includes JRE.

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How does Java work?
Java Source
(.java)
Java is easy
Java C Compiler
JIT
Compiler
Java
Interpreter
JVM

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How does Java work?
Java Source (.java)
Java Compiler
Java Bytecode
(.class)
Compile-time Environment
Java Bytecodes move locally
or through network
Class Loader
Bytecode
Verifier
Java Class Libraries
Java Interpreter
Just in Time
Compiler
Runtime System
Java Virtual
Machine
Run-time Environment
Operating System
Hardware

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Installation

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Java Installation
Go to
http://www.oracle.com/technetw
ork/java/javase/downloads
1
Download Java Platform(JDK)
version 8 update 121 and install
on your Windows system
2

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Java Installation
To set the permanent path of JDK in your
system:
1. Begin by going to My Computer
Properties.
2. Click on Advanced system setting.
3. Click on Environment Variables
option
4. Select Path variable to edit
5. Enter the path to bin folder inside
JDK installed on your system.(
Default path is C:Program
FilesJavajdk1.8.0_121bin )
1
2
3
4
5

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Go to
www.eclipse.org
Download Eclipse
Neon installer and
install on your
Windows system
1
2
Eclipse IDE Installation

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Data Types in Java
Integer BooleanCharacterFloat
Primitive Data Type
bytelongshort int
floatdouble char bool

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Data Types in Java
Data Type Value Bytes Required
byte -128 to 127 1
short -32768 to 32767 2
int -2147483648 to 2147483647 4
long
-9,223,372,036,854,775,808 to
9,223,372,036,854,775,807
8
float ±3.40282347E+38F 4
double ±1.79769313486231570E+308 8
char 0 to 65,536 2
boolean true or false 1(bit)

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Data Operators in Java
Data Operators
Arithmetic
Operators
Logical Operators
Relational
operators
Unary Operators

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Data Operations in Java
Arithmetic operators:
Operator Syntax Description
+ A + B Addition
- A – B Subtraction
/ A / B Division
* A * B Multiplication
% A % B
Modulus – Returns reminder
after division

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Unary operators:
Operator Syntax Description
++ i++ Use the current value of i and
then increment the value by 1.
++i Increment the value of i by 1
and then use the new value.
-- --i Decrement the value of i by 1
and then use the new value.
i-- Use the current value of i and
then decrement the value by 1

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Operator Syntax Decryption
> X>Y
Result is true if X if greater than Y; otherwise is
false
>= X>=Y
Result is true if X if greater than or equal to Y;
otherwise is false
< X<Y
Result is true if X if lesser than Y; otherwise is
false
<= X<=Y
Result is true if X if lesser than or equal Y;
otherwise is false
== X==Y
Result is true if X and Y are equal; otherwise is
false
!= X!=Y
Result is true if X and Y are not equal; otherwise
is false
Relational operators:

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Operator Syntax Decryption
&& False && False False
True && False False
False && True False
True && True True
|| False || False False
True || False True
False || True True
True || True True
Logical operators:

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Functions in Java
A function is a block of organized, reusable sets of instructions that is
used to perform some related actions.
Why do we use functions?
➢Re – usability of code minimizes redundancy
➢Procedural decomposition makes things organized
Function
Built-in Function
User Defined
Function

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Syntax:
modifier returnType methodName(parameters)
{
Statements…
}
Example:
public static int add(int a, int b)
{
int result;
result = a + b;
return result;
}
Functions in Java
User Defined Function
defining function
function parameters
function return value
function call
output

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Objects
➢ Object is simply a collection of data (State) and methods (Behaviour) that act on those data.
State:
• Color
• Size
• Shape
Behavior:
• Power On();
• Call ();
• Message ();

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Class
➢ Class is a blueprint from with the object are created.
class Phone{
String brand;
int batteryPower;
String processor;
.
.
public Phone(String phoneBrand, int power, String phoneProcessor)
{
brand = phoneBrand;
Batterpower = power;
processor = phoneProcessor;
}
//Other class methods
}

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Super Class
Child Class
Inheritance
➢ Inheritance is a mechanism through which one object acquires all the properties and behaviors of
parent object.
Mobile
Apple Samsung Google

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Encapsulation
➢ Encapsulation is the mechanism that binds together code and the data it manipulates together.
Authorized
User
Unauthorized
User

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Polymorphism
➢ Polymorphism is the ability of a variable, function or object to take on multiple forms.
Mobile
Camera Remote MP3 Player

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Abstraction
➢ Abstraction is the methodology of hiding the implementation details from the user and only providing
the functionality to the users.

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Session In A Minute
Java Introduction Why Learn Java Features of Java
Java Environment How does Java work Data Types in Java

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Session In A Minute
Data Operators in Java Functions in Java

What Is Java | Java Tutorial | Java Programming | Learn Java | Edureka

What Is Java | Java Tutorial | Java Programming | Learn Java | Edureka

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