Restricting a user to access only his own tables in Oracle SQL Developer
===

I am confused in the permission, privileges in the SQL Oracle Developer. The user created can access all the schema/user 's tables. I want to restrict specific user in the database to access (ALTER, DROP, UPDATE etc) to his own tables only. Can any one specifies me how to perform this task.

I mean which privileges to be choose from system privileges for the user to access only his own tables. Thank you