// Fig. 6.15: FactorialTest.java
// Recursive factorial method.
import java.awt.*;

import javax.swing.*;

public class FactorialTest extends JApplet {
   JTextArea outputArea;

   // create GUI and calculate factorials of 0-10
   public void init()
   {
      outputArea = new JTextArea();

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

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

   } // end method init
   
   // recursive declaration of method factorial
   public long factorial( long number )
   {                  
      // base case
      if ( number <= 1 )  
         return 1;

      // recursive step
      else                
         return number * factorial( number - 1 );

   } // end method factorial

} // end class FactorialTest


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