Why StackOverFlowError?

Question

Java

class Factorial {
  int factor(int n) {
    if (n != 1)
      return factor(n-1) * n;
    else
      return 1;
  }
}

class Main {
  public static void main(String[] args) {
    Factorial f = new Factorial();
    
    for (int i = 0; i < 1; i++) {
      System.out.println(f.factor(i));
    }
  }
}

The code is executed on the android application Jvdroid.

If you remove the loop and replace the argument with 10, then everything works

Answer 1

Debugging in the teeth and debugging.
You pass 0 to the factor. The if works. It then calls factor with -1. And so on until stack overflow.
The factorial of zero usually has its own treatment ;-)