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); }
