How To Install Java On Debian

login as root
edit file sources.list

    #nano /etc/apt/sources.list

Add

deb http://ftp.us.debian.org/debian/ etch main contrib non-free

Save and Exit

The next step run command :
     #apt-get update
     #apt-get install sun-java5-jre

or Build jdk

     #apt-get install sun-java5-jdk

To check whether already successfully run the command

     #java -version

If success Then it will of be like this

java version "1.6.0"

java successfully installed
good luck and good luck.