I've almost finished my studies. Actually I am looking for job to get experience but besides this I have a lot of free time. Could you tell me where can I (make relationship with ) find new people who also likes create new games or apps in java/c# and work together?
You can have a look at specialized indie game dev forums like tigsource. This forum is perfect to meet other game dev and to share some points of view about game dev.
depending on your target (platform/engine/framework) there are full communities of people, and many times there will be a section in these community forums whose sole purpose is "help wanted" (where people either post their skill set requesting a job, or post a job requesting applicants)
there are also general forums that are not specific to platform/engine/framework, but at some point that question may come up especially if your posting a job opening.