Finding the current log in user in windows

System.getProperty("user.name");

Can't get the permissions though

Use the proeprty: user.name

system property "user.name" gives you that

You should be able to find some characteristics of the current user in his/her
C:\Documents and Settings\<username as above>\NTuser.dat
It will be hard work, because that's the binary, per-user, Registry, but what you want is inthere.

;JOOP!

but how can we find the user type....and other details about this user

Use Regedit.exe to see the readable part of "Current User".
Then you might try to read the binaries from that file.

Of course direct Registry access would be better, but I leave that to you.

;JOOP!

>> and other details about this user
You can get his home directory :
   System.getProperty("user.home");

What exactly are you trying to do? If you want to find out if the current user has permissions to do something, you can use the class SecurityManager and call checkpermission on the action.

I want to check first before starting of my program that which user has logged in. If it is administrator then do this. If it is "user" then do that.

>> Use Regedit.exe to see the readable part of "Current User".
>>Then you might try to read the binaries from that file.

>>Of course direct Registry access would be better, but I leave that to you.

Which registry key I should check?

If it only concerns if someone is Administrator (or member) you might
check his access rights on a restricted area.
Locate a folder of file "private" to Administrator and use new File(...).canWrite();

;JOOP!

yes its a good idea...let me try this...But it would have been good for me if  some how I can know the registry key from where I can get the current user type...any idea ?

I have been searching for you, but ... no idea. I just never had this need.

;JOOP!

Why do you want to know what type of user it is btw?

Bcoz I am developing a custom made installer...and in that it will act as action...

So you need to know if it has write access?

Runtime.exec

cacls "C:\Documents and Settings\Administrator"

and if you're not an admin, it'll come back access denied

So you need to know if it has write access?
=
So you need to know if it has install access?

User can use this action according to his own requirement....n I want all the details of user, because this action should be scalable...