# Java Examples - Calculating Factorial

## Problem Description

How to use method for calculating Factorial of a number?

## Solution

This example shows the way of using method for calculating Factorial of 9(nine) numbers.

```public class MainClass {
public static void main(String args[]) {
for (int counter = 0; counter <= 10; counter++) {
System.out.printf("%d! = %d\n", counter, factorial(counter));
}
}
public static long factorial(long number) {
if (number <= 1) return 1;
else return number * factorial(number - 1);
}
}
```

## Result

The above code sample will produce the following result.

```0! = 1
1! = 1
2! = 2
3! = 6
4! = 24
5! = 120
6! = 720
7! = 5040
8! = 40320
9! = 362880
10! = 3628800
```

The following is an another example of factorial

```public class NumberFactorial {
public static void main(String[] args) {
int number = 5;
int factorial = number;

for(int i = (number - 1); i > 1; i--) {
factorial = factorial * i;
}
System.out.println("Factorial of 5 is " + factorial);
}
}
```

The above code sample will produce the following result.

```Factorial of 5 is 120
```
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