For youtube videos: bit.do/jevent What is Java? Why Java is unique from other languages? What we do with Java? About JRE,JDK, JVM

1. Java Technology
By
Sharmilee J
Java Trainer
Mazenet Solution

2. Objectives of this Session
• What is Java?
• Why Java?
• About IDE’s
• About JDK
• About JVM
• About JRE
• What we do in Java?

3. What is Java???

4. Java is
• Versatile Programming language
• Platform & device Independent
• General purpose
• Can run on virtually any type of computer
• Developed in 1995 by James Gosling

5. Java in today’s world

6. • Android Apps
• Server Apps at Financial Services Industry
• Java Web Applications
• Software Tools
• Trading Applications
• J2ME Apps
• Embedded Space
• Big data Technologies
• Scientific Applications

7. Why we need to learn Java??

8. 1. Easy to learn
2. Object oriented programming language
3. Rich API
4. Powerful development tools eg.
Netbeans, Eclipse
5. Great collection of open source libraries

9. 6. Wonderful community support
7. Java is FREE
8. Excellent Documentation support
9. Platform Independent
10. Java is Everywhere

10. Main Features
• Open source
• Platform Independent
• Stack object Allocation
• Highly secure
• Reusable codes
• Behavior & Nature
• User & Developer friendly

11. Integrated Development
Environment

12. Java IDE
• Software Application
• To easily write & debug Java programs
• Features of IDE
– Syntax Highlighting
– Code completion , etc.

13. IDE’s we use to create Java
Apps
• Eclipse
• Netbeans
• Jcreator
• Processing
• Blue J
• Kawa
• Jbuilder
• DrJava

14. Other IDE’s
• Geany
• IntelliJ IDEA
• Jdeveloper
• jGRASP
• jEdit
• MyEclipse
• Visual Café
• Gel
• JIPE
• Zeus
• Setu IDE

15. JDK

16. What is Jdk?
• Program development environment
• To write applet & applications
• It consists of
– Runtime environment
– Tools
– Programming

18. Java Runtime Environment

19. JRE
• Part of jdk
• Set of programming tools
It consists of
 JVM
 Core Classes
 Supporting files

20. Java Virtual Machine

21. What is JVM
• A specification
• An implementation
• Runtime Instance

22. What JVM does??
• Loads code
• Verifies code
• Executes code
• Provides runtime Environment

23. JVM Architecture

24. Java Program Execution

25. What we can do with Core
Java?
• OOP
• GUI
• Multithreading
• Client Server Programming

26. OOP

27. OOP is
• Programming language model organized
around
• objects rather than “actions” &
• data rather than “Logic”

28. Object Oriented Programming
• Object -Any entity that has state and
behavior is known as an object.
• For example: chair, pen, table, keyboard,
bike etc.
• Class - Collection of objects

29. Example for class and Objects
Class : Employee
Employee_ID
Employee_Name
Basic_Pay
Designation
calculatePay()
updateDetails()
deleteDetails()
Datas
Methods

30. Creating objects for a class
Employee
Class
E1:object1 E2:object2 E3:object3

31. OOPs Concept
• Inheritance
• Polymorphism
• Abstraction
• Encapsulation

32. Inheritance
• When one object acquires all the
properties and behaviors of parent object
• It provides code reusability.
• It is used to achieve runtime
polymorphism.

33. Real time Example

34. Polymorphism
• one task is performed by different ways
• Types
– Overloading
– Overriding

35. 35

36. Abstraction
• Hiding internal details and showing
functionality
• For example: phone call, we don't know
the internal processing.

37. Example for Abstraction

38. Encapsulation
• Binding (or wrapping) code and data
together into a single unit

39. Example for Encapsulation

40. OOP vs Procedure Oriented
Programming
• OOPs makes
development and
maintenance easier
• OOPs provides data
hiding
• OOPs provides ability
to simulate real-world
event much more
effectively
• it is not easy to manage.
• global data can be
accessed from anywhere.
• We can provide the
solution of real word
problem if we are using
the Object-Oriented
Programming language.

41. GUI

42. Graphical User Interface
• is a type of interface
• allows users to interact with electronic
devices
• through graphical icons and visual
indicators.

43. GUI Components
• Pointer
• Pointing Device
• Icons
• Frame
• Panel
• Menus

44. GUI Hierarchy in Java

45. Multithreading

46. Multithreading
• It is a process of executing multiple
threads simultaneously.
• Thread
– lightweight sub-process
– a smallest unit of processing

47. Advantage of Multithreading
• It doesn’t block the user
• It can perform many operations together
so it saves time
• Independent

48. Client Server Programming

49. Java Networking
• It is a concept of connecting two or more
computing devices together so that we
can share resources.
• Java socket programming provides facility
to share data between different computing
devices.

50. Advantage of Networking
• sharing resources
• centralize software management

51. Java Networking Terminology
• IP Address
• Protocol
• Port Number
• MAC Address
• Connection-oriented and connection-less
protocol
• Socket

52. Job Opportunities for Java

53. Job Vacancies Survey
• More than 16,000 Java positions are open
on any given day
• Java was named one of the Top 10 skills
hiring managers search for when in the
market for cloud candidates, according to
latest report

54. IT Job Roles
• Software Engineer
• Systems Analyst
• Business Analyst
• Technical Support
• Network Engineer
• Technical consultant
• Technical Sales
• Web developer
• Software Tester

55. Top Companies using Java

56. Latest in Java

57. • Latest version of java is jdk 1.8
• Launched in 2014
• Changes include
– Method References
– Parallel sort
– Improved integration with Javascript
– Addition of Calendar.Builder
– Functional Interfaces
– Lambda Expressions

59. Next Session
What’s new in Java 8????