A java variable can be declared using the keyword final. Then the
final variable can be assigned only once.
A variable that is declared as final and not initialized is called a
blank final variable. A blank final variable forces the constructors
to initialise it.
Java classes declared as final cannot be extended. Restricting
inheritance!
Methods declared as final cannot be overridden. In methods private is
equal to final, but in variables it is not.
final parameters – values of the parameters cannot be changed after
initialization. Do a small java exercise to find out the implications
of final parameters in method overriding.
Java local classes can only reference local variables and parameters
that are declared as final.
- A visible advantage of declaring a java variable as static final is,
the compiled java class results in faster performance.
For more information read this
also see Use of final keyword in Java method performance?
