JDK and IDE
JDK

Before developing Java application, the JDK must be installed on your system, which needs to be configured to work with the JDK. Once the JDK is installed, Java applications can be created.

To download the JDK

Go to the Java web site at http://www.oracle.com/technetwork/java/javase/downloads/index.html
Locate the download page for Java SE 6.
Click the Download button for JDK 6 and follow the instructions.
Save the exe file for the setup program to your hard disk.

To install the JDK, run the exe file and respond to the resulting dialog boxes. When prompted for the JDK directory, use the default directory.