Can You Access Private Variables in the Same Class?

the private field is accessible in the class/object in which the field is declared. It is private to other classes/objects outside of the one it is located in.

Can two objects from the same class access each other's private variables?

Any method within your class can access the private data of any instance of that class; there's not a way to keep data private to within an instance unless you forbid methods that explicitly access private data members of other instances.

How do you use private variables in class?

Class variables that are declared as private can not be referred to from other classes, they are only visible within their own class. It is considered better programming practice to use private rather than public class variables, and you should aim to do this in the remainder of the course.