Android :: How To File Operations Works In Android

I was wondering how the file operations works in Android. As in J2ME it has FileConnection class that takes care of most of the File operation tasks.. and it FileConnection doesn't support Android, what is the best way to accomplish the File Operation tasks? I would appreciate if someone could send me some code snippet:

1) Create a Directory( check for its existence first, if not then create it) 2) Create a File in the newly created Directory 3) Write data into the file 4) Read from the file 5) Delete the file.............