I downloaded the precompiled Eclipse Mars 4.5 in the official site here. Pseudocode

0. Extract the tarball eclipse-jee-mars-2-linux-gtk-x86_64.tar.gz
1. Move extracted Eclipse directory to some location where it can be at PATH.
2. eclipse

Sjsam's contribution [so depreciate this way]

0. Extract the tarball eclipse-jee-mars-2-linux-gtk-x86_64.tar.gz
1. sudo mv eclipse /usr/local/bin/ where /usr/local/bin/ in my PATH
2. sudo chmod 777 /usr/local/bin/
3. eclipse

Output

and in Terminal

Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.

The README does not have Unix installation instructions, just Windows one.

Additions to garethTheRed's answer

I did

sudo mv eclipse /usr/local/
sudo chmod -R 755 /usr/local/eclipse
sudo chown -R root:root /usr/local/eclipse
sudo ln -s /home/masi/eclipse/eclipse /usr/local/bin/eclipse
eclipse

Done!

How can you have Eclipse 4.5 in your Path?