// Fig. 6.12: FactorialTest.java
// Recursive factorial method

// Java core packages
import java.awt.*;

// Java extension packages
import javax.swing.*;

public class FactorialTest extends JApplet {
   JTextArea outputArea;
   int callNumber;

   // initialize applet by creating GUI and calculating factorials
   public void init()
   {
      outputArea = new JTextArea(200,100);
      JScrollPane scroller = new JScrollPane(outputArea);
      scroller.setPreferredSize (new Dimension(500, 500));

      Container container = getContentPane();
      container.add( scroller );

      // calculate the factorials of 0 through 10
      for ( long counter = 7; counter <= 10; counter++ )
      {
         callNumber = 0;
         outputArea.append("\n" + counter + "! = " +
            factorial( counter ));
	   }

   }  // end method init

   // Recursive definition of method factorial
   public long factorial( long number )
   {
	  callNumber++;
      // base case
      if ( number <= 1 )
      {
      	 outputArea.append("\nBase Case");
         return 1;
	  }

      // recursive step
      else
      {
		 outputArea.append("\n");
		 for (int i = 1; i < callNumber; i++)
		 {
			 outputArea.append("\t");
		 }
         outputArea.append("Not Base # " + callNumber + " Call Value " + number);
         return number * factorial( number - 1 );

	  }//else

   }  // end method factorial

}  // end class FactorialTest