i hav a project on mind and the proj is to be able to control my laptop from my mobile,controls like shutting the laptop down.i'v gotten d phone simulator and i code with netbeans.i hav an ok knowledge in j2se,i believe it is possible if yes what next?

You need to be more specific about it.
There are similar application on the market for some time, as example I can tell you the idea of remote controller is implemented on Sony Ericsson phones w800, w810, w880 and w910 (these are phones that I used or borrowed from girlfriend). So yes you can attempt to make something like this, however your main problem problem would be how you gone communicate the commands to computer? You will need to look into Java Remote Method Invocation and Java Native Interface (somebody correct me if I'm wrong on these two)