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Final Variables

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.

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