Thisprogram calculates n! with a recursive method. Factorial.java

Factorial.java
The "classic" recursive demo. The Factorial function can be described as
n! = n * (n - 1) * (n - 2)... * 2 * 1
We can also describe it with the following recursive definition
n! = n * (n - 1)!, where n! = 1 for n = 1.
Thisprogram calculates n! with a recursive method. It also provides a
non-recrusive solution for comparison purposes.
The recursive form. Note the terminating condition and the recursive call.
the non-recrusive form
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