You can declare a variable in any scope to be final,
including parameters to methods and constructors.
The value of a final variable cannot change after it has been initialized.
To declare a final variable,
use the final keyword in the variable declaration
before the type:
final int aFinalVar = 0;
The previous statement declares a final variable and initializes it,
all at once.
Subsequent attempts to assign a value to aFinalVar
result in a compiler error.
You may, if necessary, defer initialization of a final local variable.
Simply declare the local variable and initialize it later, like this:
final int blankfinal;
. . .
blankfinal = 0;
A final local variable that has been declared
but not yet initialized is called a blank final.
Again, once a final local variable has been initialized it cannot be set
and any later attempts to assign a value
to blankfinal result in a compile-time error.
