java - Can all users access the tables created in my schema? -

I have installed Oracle 12c, SQL Developer, and have created many tables ... but in my schema.
I want to make an Oracle DB backend at the front of Java.

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This is more than one question but, you create an account (or multiple accounts) for tables and stored procedures and tasks, and yes, once it can be made to anyone (unless they have the necessary permissions) and Yes, they can run stored procedures and actions you create (again, if they have the necessary permissions).