Simple steps to Install Java on Ubuntu

1. Simple steps to Install Java on Ubuntu

   
   From the application>accessories>terminal root# type the command
   
   
   add-apt-repository "deb http://archive.canonical.com/ lucid partner"
   also enable canonical repositories from System>Administration>Software Sources
2. Then type in the command
   sudo apt-get install sun-java6-jdk
   This will install jdk at /usr/lib/jvm location.
3. Install other candidates sudo apt-get install sun-java6-jre sun-java6-plugin sun-java6-fonts
4. To setup sun jdk as default type in the below command
   sudo update-java-alternatives -s java-6-sun

Installation on my system were like this ;

eg: root@ubuntu:/# sudo update-java-alternatives -l

java-6-openjdk 1061 /usr/lib/jvm/java-6-openjdk

java-6-sun 63 /usr/lib/jvm/java-6-sun

5. Add the following line to etc/jvm file. If the file is not present create a jvm file and add the following to the top of the file /usr/lib/jvm/java-6-sun
6. Check the version of the java from command prompt>java -version
   Other commands :
   root@ubuntu:/home/localadmin# echo $JAVA_HOME

/usr/lib/jvm/sun-6-java

root@ubuntu:/home/localadmin# whereis javac

javac: /usr/bin/javac /usr/share/man/man1/javac.1.gz

. only can run cmd line jedit

Set JAVA_HOME

sudo nano /etc/bash.bashrc
and add
JAVA_HOME=/usr/lib/jvm/java-6-sun
export JAVA_HOME

2. support gui jedit
sudo vim /etc/environment
and add
JAVA_HOME="/usr/lib/jvm/java-6-sun"

Also You can use Synaptic Manager on your desktop go to System ->Preference->Synaptic Manager.

Search for sun java and you should be able to install from there as well