java factorial function math

// Factorial program using recursion public class FactorialRecursion { public static void main(String[] args) { int factorial = 1; int number = 6; factorial = factorialFunction(number); System.out.println("Factorial of " + number + " is : " + factorial); } static int factorialFunction(int num) { if(num == 0) { return 1; } else { return(num * factorialFunction(num - 1)); } } }

public class FactorialDemo { public static void main(String[] args) { int number = 6, factorial = 1; for(int a = 1; a <= number; a++) { factorial = factorial * a; } System.out.println("Factorial of " + number + " is : " + factorial); } }

factorial method library in java

2.4. Factorial Using Apache Commons Math
Apache Commons Math has a CombinatoricsUtils class with a static factorial method that we can use to calculate the factorial.

To include Apache Commons Math, we'll add the commons-math3 dependency into our pom:

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-math3</artifactId>
    <version>3.6.1</version>
</dependency>
Let's see an example using the CombinatoricsUtils class:

public long factorialUsingApacheCommons(int n) {
    return CombinatoricsUtils.factorial(n);
}

Posted by: Guest on January-23-2021

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