// calculating factorials using a method
import javax.swing.JOptionPane;
public class Factorials {
   public static void main( String[] args )
   {		int number, index;      
		// int result = 1;
    	String numString1 = JOptionPane.showInputDialog(null, 
      	"Enter an integer from 2 - 16 ", "Input Number Window", 
      	JOptionPane.QUESTION_MESSAGE);
     	number = Integer.parseInt(numString1);
		if (number > 1 && number < 17) {
                 System.out.println("The factorial of "+number+" is " + factorialMethod(number));
                } // end if number > 1 ...
                else
		{
		System.out.println(number + " is not a valid number for this computation.");
		}
      	System.exit( 0 );   
   } // end main
   public static int factorialMethod (int x ) 
   {
 	int result = 1;  
        for (int counter = 1; counter <= x; counter ++) { 
                 result = result * counter;
         } // end of for index
         return result;
   } // end of factorialMethod
} // end of program