// Fig. 4.12: FactorialTest.java
// Recursive factorial method
import java.awt.Graphics;
import java.applet.Applet;

public class FactorialTest extends Applet {
   public void paint( Graphics g )
   {
      int yPosition = 25;

      for ( long i = 0; i <= 10; i++ )  {
         g.drawString( i + "! = " + factorial( i ),
                       25, yPosition );
         yPosition += 15;
      }
   }
   
   // Recursive definition of method factorial
   public long factorial( long number )
   {                  
      if ( number <= 1 )  // base case
         return 1;
      else
         return number * factorial( number - 1 );
   }  
}