Calculate Factorial in Java: Explanation & Practice

Calculate factorial of a number

Problem summary

Write a program that calculates n! (factorial). Your code should work for any non-negative integer.

Starter code

public class Main {
    public static void main(String[] args) {
        int n = 5; // Test case 1
        
        // Calculate n! = n * (n-1) * ... * 1
        // Print: Factorial: <result>
    }
}

Expected output and test cases

5! = 120
```
Factorial: 120
```
4! = 24
```
Factorial: 24
```
0! = 1
```
Factorial: 1
```

Hints

Start from 1 and multiply up to n
Or start from n and multiply down to 1
0! is defined as 1

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