Can anyone tell my how can I get a job in cruises like star and carnival?

Job doing what? Most WEB sites have a careers section where you can apply for jobs.

Have you tried this?

Fun Jobs - Carnival Cruise Lines

I don't know about you but I have been on 6 cruises and from what I have seen it is a lot of work. Its not all fun and games. Plus they don't follow american labour laws. These ships are registered in the bahama's and a few african countries and even panama. So you have to ask yourself what is the minimum wage in panama. If they even have one. In the US it is about 7 $ an hour. Most of the workers are from the Philippines which is a POOR country so even 2 hundred dollars a week is a lot of money.

But too answer your question. Go to the cruise lines web site and look at the bottom you will see employment click on that. I do know this you sign a contract for 18 months... 6 month training cruise then 12 months straight at sea. If you quit you fly home from wherever the ship is at. Plus if you do stick the year out and the ship ends up in rome or south hampton or even the orient you have to fly home on your own dime meaning you pay your own way.

I though about it but though I better not.. theirs not much money in to but if you are young have no kids and money is not an issue try it it will be a great experience