I have installed eclipse cdt on my slack14.
It's in /opt and /opt/eclipse/eclipse is
soft-linked to /usr/local/bin/ and one ascii
file named eclipse is in /usr/bin (it sets env var of eclipse)
export ECLIPS_HOME="/opt/eclipse"
$ECLIPSE_HOME/eclipse $*

My question is: Is it possible to install eclipse
for Java on this system? I tried to unzip eclipse
for java in /usr/share and later ~/.

I created a small project and built it but when
I tried to run the project it started another
instance of eclipse.(only happens at the run
time of the project)

If it's possible then I want to keep
two versions of eclipse.

Please let me know.

Thnak you.

it is surely possible, just you need to construct a path with the actual instance only. (so you need to remove the other one from the path)

Thanks.

I have unzipped eclipse for java in /usr/share and
invoke $ /usr/share/eclipse/eclise. Project compilation is
successfully done but when I try to run, eclipse again begins
to load into memory (as it happens when we start eclipse either
by clicking or invoking from cli)

that looks like you have a launcher, but hard to say from here