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Use of the final keyword:

1. When the final keyword modifies a variable of a primitive type, the variable cannot be re-assigned, and the first value is final.
2. When the FIANL keyword modifies a reference-type variable, the variable cannot be re-directed to the new object.
3. When the final keyword modifies a function, the function cannot be overridden.
4. When the final keyword decorates a class, the class cannot be inherited. Using a method that doesn't want to be overridden by someone else, you can avoid it by using the final keyword directly.

Constant modifiers are generally: public static final

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