Tuesday, 3 May 2011

Sun Java as default in Ubuntu

If you're using Ubuntu  11.10 (oneiric ocelot), please check this entry. Since 11.10, Sun/Oracle's Java JDK has been removed from all (Ubuntu/Canonical) repositories.

Just to summarise the information I got from


in order to get Sun's Java Development Kit (JDK) up and running under Ubuntu (I'm using 11.04).

You may use Synaptic (the package manager) to add the "Canonical Partners" repository, reload, then find and install sun-java6-jdk.

Otherwise, open a terminal session and type the following:
sudo add-apt-repository "deb http://archive.canonical.com/ maverick partner"

sudo add-apt-repository "deb http://archive.canonical.com/ natty partner"

...depending on whether you have Ubuntu maverick (10.11) or natty (11.10). Then add:

sudo apt-get update
sudo apt-get install sun-java6-jdk
In case you had OpenJRE, OpenJDK, GCJ or similar (free, OSS Java alternatives) already in your system you may want to ensure Sun's JRE & JDK are the default. Still using the terminal, type:
sudo update-alternatives --config java
and select your preferred alternative from the list. To select a Java compiler, type
sudo update-alternatives --config javac
Now on to the testing. You should get the version numbers of the currently installed and default runtime and compiler by typing (in the terminal):
java -version
javac -version
...and that should be it.

I'd recommend you to use Geany as a source editor/IDE.

Sunday, 1 May 2011

Hack your Ubuntu 11.04

Yes, the new Ubuntu is here!

So it's time to tweak it and personalise it, of course.

I'm quite short on time, so I'll be brief. will do what I can to revisit this post and make it more visual and detailed.

This is what I usually do right after I install Ubuntu:

{ Switch the window buttons back to the right hand side }

press ALT+F2 and type gconf-editor
Press Enter and navigate to /apps/metacity/general/button_layout
Change the button_layout to :minimize,maximize,close

More on:
Top Things to do after installing Ubuntu 11.04 Natty Narwhal

{ Go back to the classic Ubuntu, with Gnome desktop }
"...logout and then after clicking on your username, select Ubuntu Classic Desktop at the bottom of the login screen." Thanks Scottlinux!

[ Optional ]
In the Terminal, type:
sudo apt-get install mc build-essential gnome-themes gnome-themes-extras gnome-themes-more startupmanager shutter

Class Relationships

Please read these two resources to have a better understanding of class relationships http://creately.com/blog/diagrams/class-diagram-rel...