Modifiers In Java

It is possible to modify classes, methods, etc., by using modifiers. There are two categories of modifiers:

• Access Control Modifiers : default, public, protected, private
• Non Access Modifiers : static, final, abstract, synchronized

Access Control Modifiers:

Java provides access modifiers to set access levels for classes, variables, methods. 

The four access levels are:

1. Visible to the package, the default. No modifiers are needed.
2. Visible to the class only (private).
3. Visible to the world (public).
4. Visible to the package and all subclasses (protected).

Non Access Modifiers:

Java provides 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.