import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class GUIRationalTester extends JApplet implements ActionListener {
   private Rational r1,r2,result;

   private JLabel 	numeratorLabel1, 
   			numeratorLabel2, 
			denominatorLabel1, 
			denominatorLabel2;

   private JTextField 	numeratorField1, 
			numeratorField2, 
			denominatorField1, 
			denominatorField2,
			displayField;

   private JButton addButton;

   // create Time3 object and set up GUI
   public void init()
   {
      // get applet's content pane and change its layout to FlowLayout
      Container container = getContentPane();  
      container.setLayout( new FlowLayout() ); 

      // set up Labels and Fields
      numeratorLabel1 = new JLabel( "r1 numerator" );
      numeratorField1 = new JTextField( 10 );
      denominatorLabel1 = new JLabel( "r1 denominator" );
      denominatorField1 = new JTextField( 10 );

      container.add( numeratorLabel1 );
      container.add( numeratorField1 );

      container.add( denominatorLabel1 );
      container.add( denominatorField1 );

      numeratorLabel2 = new JLabel( "r2 numerator" );
      numeratorField2 = new JTextField( 10 );
      denominatorLabel2 = new JLabel( "r2 denominator" );
      denominatorField2 = new JTextField( 10 );

      container.add( numeratorLabel2 );
      container.add( numeratorField2 );

      container.add( denominatorLabel2 );
      container.add( denominatorField2 );

 
      // set up displayField
      displayField = new JTextField( 30 );
      displayField.setEditable( false );
      container.add( displayField );

      // set up addButton
      addButton = new JButton( "Add" );
      container.add( addButton);

      // register event handlers; this applet is the ActionListener, 
      // which contains method actionPerformed that will be called to 
      // handle action events generated by addButton
 
      addButton.addActionListener( this );

   } // end method init

   // event handler for button and textfield events
   public void actionPerformed( ActionEvent event )
   {
      int a = Integer.parseInt(numeratorField1.getText()); 
      int b = Integer.parseInt(denominatorField1.getText()); 
      int c = Integer.parseInt(numeratorField2.getText()); 
      int d = Integer.parseInt(denominatorField2.getText()); 

      r1 = new Rational(a,b);
      r1.reduce();
      
      r2 = new Rational(c,d);
      r2.reduce();

      result = r1.add(r2);
      result.reduce();   
      

      displayField.setText(r1.toString() + " + " + r2.toString() + " = " + result.toString());


   } // end method actionPerformed

} // end class GUIRationalTester