Java Modifier Keywords

Modifiers in Java are keywords that you add to variables, classes, and methods in order to change their meaning.

FINAL: 

• if a class is declared as final, it can not be inherited (or extended)
• if a method is declared as final, it is not possible to override that method in the child class
• if a variable is declared , reassignment is not possible
• instance methods are bond with objects, and static methods are bond with class
• class containing main method is executed by JVM
• final class variables are not a final but final class methods are final by default ( because extension is not possible)

 They can be broken into two groups:

1. Access control modifiers
2. Non-access modifiers

MODIFIER	DESCRIPTION
public	Visible to the world
private	Visible to the class
protected	Visible to the package and all subclasses

MODIFIER	DESCRIPTION
static	Used for creating class methods and variables
final	Used for finalizing implementations of classes, variables, and methods
abstract	Used for creating abstract methods and classes
synchronized	Used in threads and locks the method or variable so it can only be used by one thread at a time
volatile	Used in threads and keeps the variable in main memory rather than caching it locally in each thread