Where to install Eclipse on Ubuntu

I don't know. I'm not an expert on Linux system at all.
However, I found a nice post and decided to install under /opt folder.

sudo mv eclipse /opt/eclipse cd /opt sudo chown -R root:root eclipse
sudo mv eclipse /opt/eclipse cd /opt sudo chown -R root:root eclipse
sudo chmod -R +r eclipse
sudo chmod +x `sudo find eclipse -type d`
Then create an eclipse executable in your path
sudo touch /usr/bin/eclipse
sudo chmod 755 /usr/bin/eclipse
sudoedit /usr/bin/eclipse
With these contents:
#!/bin/sh
export ECLIPSE_HOME="/opt/eclipse"
$ECLIPSE_HOME/eclipse $*

http://informationideas.com/news/2008/11/16/where-to-install-eclipse-on-ubuntu/
http://flurdy.com/docs/eclipse/install.html