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		public class HelloWorld {
			public static void main(String[] args) {
				System.out.println("Hello World");
			}//End of main
		}//End of HelloWorld Class
		

If you running java program on the top you will get output: 'Hello World' in the command line



Software and Installations
Before we can run java program in our computer, we must install Java Developer's Kit (JDK). The Java Developer's Kit is distributed by Sun Microsystems. The JDK contains documentation, examples, installation instructions, class libraries and packages, and tools. Please visit sun microsystems website and donwload it. And after you finish install it, you must set "Path" and "Classpath".

PATH and CLASSPATH
To set the PATH of jdk on your system (Windows XP), add the full path of the jdk\bin directory to the PATH variable. Set the PATH as follows on a Windows machine:

1. Click Start > Right Click "My Computer" and click on "Properties".
2. Click Advanced > Environment Variables.
3. Add the location of bin folder of JDK installation for PATH in User Variables and System Variables. A typical value for PATH is:

C:\Program Files\jdk<version>\bin

C:\Program Files\jdk<version>\lib\tools.jar 

If there are already some entries in the PATH variable then you must add a semicolon and then add the above value (Version being replaced with the version of JDK). The new path takes effect in each new command prompt window you open after setting the PATH variable.

Save, Compile, and Running Simple Program
First, write your code in editor like notepad, wordpad, or editpad. Save as that the name of file same as the name of class. For example from the HelloWorld program we can save with the name is "HelloWorld.java". Please remember that the extension file is *.java.

Second, compile program with open command prompt and type javac <path file>HelloWorld.java. If compile success, new file will be created that the name is "HelloWorld.class".

Third, running your program with type java <path file>HelloWorld.class.

Characteristic of Java

    Simple
    Reusable
    Portable (Platform Independent)
    Familiar
    Robust
    Secure
    High Performance
    Dynamic
    Threaded
    Interpreted.

Main Java Technology
Java SE
Java standart version to create Dekstop Application.

Java ME
Java version to create Mobile application such as HandPhone, PDA, iPod, TV, etc.

Java EE
Java Enterprise version to create large application such as Web App and Network App.

Java FX
Java Flash version to create Rich Animation Swing Desktop Client.

Other Java Technologies
Java 2D
Java 3D
Java Web Service
Java Network
Java Card
Java XML
Java Mail
Java Cryptography
etc