```
public class Factorial {
/**
* illustrates a recursive factorial
*/
public static void main(String[] args) {
System.out.println(factorial(3));
System.out.println(factorial(10));
// you can also compute factorial in a loop
}
/**
Paramters: integer n
Returns: n! for non-negative n, 1 for negative n
**/
public static int factorial(int n) {
if (n <= 1) return 1;
return n * factorial(n - 1);
}
}
```

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