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## Factorial |
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### Instructions |
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In a file named `Factorial.java` write a function `factorial` that calculates the factorial of a non-negative integer given as a parameter. |
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> The factorial of a non-negative integer n (denoted as n!) is the product of all positive integers less than or equal to n. For example, 5! = 5 × 4 × 3 × 2 × 1 = 120. |
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> Note: The factorial of 0 is 1, according to the [convention](https://www.chilimath.com/lessons/intermediate-algebra/zero-factorial/) |
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### Expected Functions |
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```java |
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public class Factorial { |
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public static Integer factorial(Integer n) { |
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// your code here |
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} |
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} |
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``` |
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### Usage |
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Here is a possible `ExerciseRunner.java` to test your function : |
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```java |
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public class ExerciseRunner { |
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public static void main(String[] args) { |
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System.out.println(Factorial.factorial(3)); |
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} |
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} |
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``` |
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and its output : |
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```shell |
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$ javac *.java -d build |
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$ java -cp build ExerciseRunner |
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6 |
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$ |
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``` |
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