Bound properties listeners sources javabeans

Question

Hi all
I am working on an assignment for college, trying to learn Java etc,
Basically I need one object to react to events in another
Code is as follows
// Extra Panel
package myPackage1;
import java.awt.GridLayout;
import java.beans.PropertyChangeEvent;
import javax.swing.JPanel;
public class ExtraPanel extends JPanel implements
java.beans.PropertyChangeListener,
java.io.Serializable
private static final long serialVersionUID = 1L;
public JPanel thisPanel;
public JPanel ExtraPanelMethod()
thisPanel = new JPanel();
GridLayout grid = new GridLayout();
grid.setColumns(1);
grid.setHgap(10);
grid.setRows(6);
grid.setVgap(5);
thisPanel.setLayout(grid);
return thisPanel;
public void propertyChange(PropertyChangeEvent evt)
// The Slider Class
package myPackage1;
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.JFormattedTextField;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.text.NumberFormatter;
public class TheSliderClass extends JPanel implements ChangeListener
private static final long serialVersionUID = 1L;
//Add a formatted text field to supplement the slider.
public JFormattedTextField textField,textField2;
JFormattedTextField newValue = null;
JFormattedTextField oldValue = null;
public String publicSliderName = "";
public int fps;
//And here's the slider.
public JSlider sliderParameterValue;
JPanel labelAndTextField,allTogether;
int TractiveEffort = 0;
public JPanel TheSliderClassMethod(String sliderName, int minimumValue, int maximumValue)
JPanel allTogether = new JPanel();
Font font = new Font("palatino linotype regular", Font.BOLD, 12);
int initialValue = ((minimumValue+maximumValue)/2);
int tickMarkValue = (maximumValue-minimumValue);
publicSliderName = sliderName;
//Create the label.
JLabel sliderLabel = new JLabel(sliderName,JLabel.CENTER);
sliderLabel.setAlignmentX(Component.CENTER_ALIGNMENT);
sliderLabel.setFont(font);
sliderLabel.setForeground(Color.BLUE);
//Create the formatted text field and its formatter.
java.text.NumberFormat numberFormat =
java.text.NumberFormat.getIntegerInstance();
NumberFormatter formatter = new NumberFormatter(numberFormat);
formatter.setMinimum(new Integer(minimumValue));
formatter.setMaximum(new Integer(maximumValue));
textField = new JFormattedTextField(formatter);
textField.setValue(new Integer(initialValue));
textField.setColumns(3); //get some space
textField.setEditable(false);
textField.setForeground(Color.red);
textField2 = new JFormattedTextField(formatter);
textField2.setValue(new Integer(initialValue));
textField2.setColumns(3); //get some space
textField2.setEditable(false);
textField2.setForeground(Color.red);
//Create the slider.
sliderParameterValue = new JSlider(JSlider.HORIZONTAL,
minimumValue, maximumValue, initialValue);
sliderParameterValue.addChangeListener(this);
//Turn on labels at major tick marks.
sliderParameterValue.setMajorTickSpacing(tickMarkValue);
sliderParameterValue.setMinorTickSpacing(10);
sliderParameterValue.setPaintTicks(true);
sliderParameterValue.setPaintLabels(true);
sliderParameterValue.setBorder(
BorderFactory.createEmptyBorder(0,0,0,0));
sliderParameterValue.setBackground(Color.cyan);
//Create a subpanel for the label and text field.
JPanel labelAndTextField = new JPanel(); //use FlowLayout
labelAndTextField.setBackground(Color.cyan);
labelAndTextField.add(sliderLabel);
labelAndTextField.add(textField);
//Put everything together.
GridLayout gridThis = new GridLayout();
gridThis.setColumns(1);
gridThis.setRows(2);
allTogether.setLayout(gridThis);
allTogether.add(labelAndTextField);
allTogether.add(sliderParameterValue);
allTogether.setBorder(BorderFactory.createBevelBorder(1,Color.red,
Color.red));
return allTogether;
/** Listen to the slider. */
public void stateChanged(ChangeEvent e)
JSlider source = (JSlider)e.getSource();
fps = (int)source.getValue();
textField.setText(String.valueOf(fps));
textField2.setText(String.valueOf(fps));
How do I get Extra Panel to React to the slider in the Slider Class being moved?
Thanks all

Answer 1

PropertyChangeListener listener = new ExtraPanel();
Component component = new TheSliderClass();
component.addPropertyChangeListener( listener );