Access Control Modifiers and non access modifiers

Access Control Modifiers:

Java provides a number of access modifiers to set access levels for classes, variables, methods and constructors. The four access levels are:

•     Visible to the package, the default. No modifiers are needed.
•     Visible to the class only (private).
•     Visible to the world (public).
•     Visible to the package and all sub classes (protected).

Non Access Modifiers:

Java provides a number of non-access modifiers to achieve many other functionality.

•     The static modifier for creating class methods and variables
•     The final modifier for finalizing the implementations of classes, methods, and variables.
•     The abstract modifier for creating abstract classes and methods.
•     The synchronized and volatile modifiers, which are used for threads.