Thermometer

I have to write an applet that displays a thermometer. The user should be able to control the temperature with a slider component. When the slider is moved, the thermometer should show a corresponding temperature.

Problem: I can get the slider component working, but I do not know how to tie in a moving bar into the equation. How do I make a rectangle ( which acts as the thermometer) to move with the slider? I know that I am supposed to use something like  myRect.height = slider.getValue();, but that doesn't help any. I hope this is a quick solution.

Here is the code that a I have so far.

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

public class TempConverter extends JFrame
{
private JLabel label1, label2; //Display labels
private JTextField fahrenheitTemp, centigradeTemp;
private JPanel fpanel, cpanel, sliderPanel;
private JSlider slider; //Temperature adjuster
private Container contentPane; //Content pane
/**
*Constructor
*/
public TempConverter()
{
//Set the title
setTitle("Temperature");

//Specify what happens when the
//close button is clicked.
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//Create the labels.
label1 = new JLabel("Fahrenheit: ");
label2 = new JLabel("Centigrade: ");

//Create the read-only text fields.
fahrenheitTemp = new JTextField("0.0", 10);
fahrenheitTemp.setEditable(false);
centigradeTemp = new JTextField("0.0", 10);
centigradeTemp.setEditable(false);

//Create the slider
slider = new JSlider(JSlider.HORIZONTAL,0,100,0);
slider.setMajorTickSpacing(20);
slider.setMinorTickSpacing(5);
slider.setPaintTicks(true);
slider.setPaintLabels(true);
slider.addChangeListener(new SliderListener());

//Create panels and place the components in them.
fpanel = new JPanel();
fpanel.add(label1);
fpanel.add(fahrenheitTemp);
cpanel = new JPanel();
cpanel.add(label2);
cpanel.add(centigradeTemp);
sliderPanel = new JPanel();
sliderPanel.add(slider);

//Get the content pane.
contentPane = getContentPane();
contentPane.setLayout(new GridLayout(3,1));
contentPane.add(fpanel);
//contentPane.add(cpanel);
contentPane.add(sliderPanel);

//Pack and display the frame.
pack();
setVisible(true);
}
/**
*Private inner clas to handle the change events
*that are generated when the slider is moved.
*/
private class SliderListener implements ChangeListener
{
public void stateChanged(ChangeEvent e)
{
double fahrenheit, centigrade;
DecimalFormat fmt = new DecimalFormat("0.0");

//Get the slider value
centigrade = slider.getValue();

//Convert the value to Fahrenheit.
//fahrenheit = (9.0 / 5.0) * centigrade + 32.0;
fahrenheit = slider.getValue();

//Store the centigrade temp in its display field.
centigradeTemp.setText(Double.toString(centigrade));

//Store the Fahrenheit temp in its display field.
fahrenheitTemp.setText(fmt.format(fahrenheit));
}
}

/**
*This program creaates an instance of the TempConverter
*class, which displays a window with a slider.
*/

public static void main(String[] args)
{
// TODO, add your application code
TempConverter tc = new TempConverter();
System.out.println("Temperature Program.");
}
}