Access Modifiers

• For top level classes, use one of:
  • public
  • no modifier (aka default/package-private)
• For attributes, methods, constructors, or nested/inner class use one of:
  • public
  • private
  • no modifier (aka default/package-private)
  • protected

Private

• The access level of a private modifier is only within the class. It cannot be accessed from outside the class.

Default

• aka Package Private
• The access level of a default modifier is only within the package. It cannot be accessed from outside the package. If you do not specify any access level, it will be the default.
• Java does not have concept of sub-packages, odp.proj and odp.proj.test are completely separate packages
• https://stackoverflow.com/questions/1967229/making-certain-methods-visible-only-to-particular-packages

Protected

• The access level of a protected modifier is:
  • within the package
  • outside the package through child class
• If you do not make the child class, it cannot be accessed from outside the package.

Public

• The access level of a public modifier is everywhere. It can be accessed from within the class, outside the class, within the package and outside the package.

ref: https://www.javatpoint.com/access-modifiers

Modifier	Class	Package	Subclass	World
public	Y	Y	Y	Y
protected	Y	Y	Y	N
no modifier	Y	Y	N	N
private	Y	N	N	N