BlueJ is a Java IDE specifically designed to learn and teach object-oriented programming and Java.
Installing BlueJ and JDK on your standard Xandros OS:
1. sudo kwrite /etc/apt/sources.list
2. Add: deb ftp://ftp.de.debian.org/debian/ stable main contrib non-free and save.
3. sudo apt-get update
4. sudo apt-get install sun-java5-jdk sun-java5-plugin
Done. The JDK is now installed. To install BlueJ:
5: Download latest version: http://bluej.org/download/download.html
6. java -jar name_jarfiles.jar (eg. java -jar bluej-221.jar)
Follow the installation applcation and your done. Credit to Chrisu