1. Java Technology
Jussi Pohjolainen
Tampere University of Applied Sciences

2. INTRODUCTION TO JAVA
TECHNOLOGY

3. Introduction to Java
• Java is a programming language developed by
James Gosling at Sun Microsystems
• Released in 1995
• Syntax derived from C and C++

4. History
• Java 1.0 in 1995
• Initial Success:
– Write Once Run Anywhere (WORA)
– Web Browsers incorporated the ability to run small
Java – programs called Applets
• Java 2 was introduced in 1998, divided into three
categories:
– Java2 Enterprise Edition (J2EE)
– Java2 Standard Edition (J2SE)
– Java2 Micro Edition (J2ME)

5. Today
• In 2006 Sun renamed Java 2 versions
– Java EE
– Java SE
– Java ME
• Java versioning: 1.0, 1.1, 1.2, 1.3, 1.4, 1.5 and
1.6 (which is the current)
• Most popular programming language!
– http://www.tiobe.com/index.php/content/paperin
fo/tpci/index.html

6. Java on Desktop: SwingSet demo

7. Java on Mobile: Opera Mini

8. Java on Server: Etuovi.com

9. Java's Future?
• Very few Java desktop apps
– Sluggish performance?
– Why use Java when you have Qt?
• Popular on the enterprise and mobile side
– Mobile programming is under heavy turbulence at the
moment:
• Nokia's Qt (C++)
• Apple's iPhone (Objective-C)
• Google's Android (Java)
• Sun Microsystem's financial trouble, Oracle
bought Sun in April 2009!

10. Compiling Java Apps
http://java.sun.com/docs/books/tutorial/getSt
arted/intro/definition.html

11. Compiling Qt Apps
http://www.symbianresources.com/tutorials/q
t/01-QtIntroduction.pdf

12. JAVA TOOLS

13. Java Tools
• Three platforms: Java SE, Java ME, Java EE
• Java SE is used for desktop apps:
– Java SE Runtime Environment (JRE)
• For running Java apps
– Java SE Development Kit (JDK)
• For developing and running Java Apps
• Includes JRE!

14. NetBeans Bundle
• The JDK comes with only the necessary tools
to compile and run apps
• The JDK with NetBeans bundle is a IDE
(Integrated Development Environment) that
has all the tools to create Java SE apps

15. NetBeans on Mac OS X

16. Using Text Editor and JDK
• NetBeans is very powerful tool for creating
Java Apps
• If you are about to start learning
programming, I do not recommend NetBeans,
use plain text editor and JDK instead!
– NetBeans does a lot work in the background
– NetBeans can be sluggish on older computers
– NetBeans can be confusing for junior
programmers

17. Basic JDK Commands
(Command Prompt)
• javac – Java Compiler
– javac MyProgram.java
• java – Running Java Apps
– java MyProgram
• That's it!

19. NotePad++
• Free text editor indented for programming
(Windows)
• Change settings / preferences
– New Document: Format: Unix / Windows
• Depending on your configuration
– New Document: Encoding: ISO-8859-1
– New Document: Default Language: Java
– Document: Tab Size 4, [x] Replace by Space

20. Exercise
• Download and configure Notepad++
• Download Java SE 6
• Read ...
– http://java.sun.com/docs/books/tutorial/getStart
ed/cupojava/win32.html
• ... and Compile and run "HelloWorld"-
application