Temperature Converter GUI

// Arman Majumder
//Temperature Converter GUI
// Requires Thermometer Class <Thermometer.java>  Included in bottom

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

    public class Converter extends JFrame
   {
      private Thermometer thermo = new Thermometer();
      private JLabel fahrLabel = new JLabel("Degrees Fahrenheit");
      private JLabel celsiusLabel = new JLabel("Degrees Celsius");
      private JTextField fahrField = new JTextField("32.0");
      private JTextField celsiusField = new JTextField("0.0");
      private JButton fahrButton = new JButton("Convert >>>");
      private JButton celsiusButton = new JButton("<<< Convert");
      
       public Converter()
      {
         JPanel dataPanel = new JPanel(new GridLayout(2, 2, 12, 6));
         dataPanel.add(fahrLabel);
         dataPanel.add(celsiusLabel);
         dataPanel.add(fahrField);
         dataPanel.add(celsiusField);
      
         JPanel buttonPanel = new JPanel();
         buttonPanel.add(fahrButton);
         buttonPanel.add(celsiusButton);
         Container container = getContentPane();
         container.add(dataPanel, BorderLayout.CENTER);
         container.add(buttonPanel, BorderLayout.SOUTH);
         fahrButton.addActionListener(new FahrenheitListener());
         celsiusButton.addActionListener(new CelsiusListener());
      }
   	
       private class FahrenheitListener implements ActionListener
      {
          public void actionPerformed(ActionEvent e)
         {
            try
            {
               String input = fahrField.getText();
               double fahr = Double.parseDouble(input);
               thermo.setFahrenheit(fahr);
               double celsius = thermo.getCelsius();
               celsiusField.setText(String.format("%.2f", celsius));
            }
                catch(Exception ex)
               {
                  JOptionPane.showMessageDialog(null, "ERROR: Input Syntax");
               }
         }
      }
   
       private class CelsiusListener implements ActionListener
      {
          public void actionPerformed(ActionEvent e)
         {
            String input = celsiusField.getText();
            double celsius = Double.parseDouble(input);
            thermo.setCelsius(celsius);
            double fahr = thermo.getFahrenheit();
            fahrField.setText(String.format("%.2f", fahr));
         }
      }  
      
       public static void main(String [] args)
      {
         Converter theGUI = new Converter();
         theGUI.setTitle("F to C Converter");
         theGUI.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         theGUI.pack();
         theGUI.setVisible(true);
      } 
   }

//////////////////////////////////////////////////////////////////////////////////
//Thermometer Class 
// New Program
//////////////////////////////////////////////////////////////////////////////////

// Arman Majumder
// Corresponds with Temperature Converter GUI <Converter.java>

    public class Thermometer 
   {
      private double degreesCelsius;
   
       public void setCelsius(double degrees)
      {
         degreesCelsius = degrees;
      }
       public void setFahrenheit(double degrees)
      {
         degreesCelsius = (degrees - 32.0) * 5.0 / 9.0;
      }
       public double getCelsius()
      {
         return degreesCelsius;
      }
       public double getFahrenheit()
      {
         return degreesCelsius * (9.0 / 5.0) + 32.0;
      }   
   }