what should be public what should be privateas a

Question

What should be public? What should be private?

As a rule of thumb:

1. Classes are public.
2. Fields are private.
3. Constructors are public.
4. Getter and setter methods are public.
5. Other methods must be decided on a case by case basis.

All of these rules might be freely violated if you have a purpose for doing so. These are simply the defaults in which handle 90 percent of the cases.