New to Java (Bound Properties)

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 a method in Extra Panel to multiple the values in textField2 to react to the slider in the Slider Class being moved?
Thanks all
Message was edited by:
N_Gen_Steam_Dev
Message was edited by:
N_Gen_Steam_Dev

Answer 1

The code now is
// 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.addPropertyChangeListener(new ExtraPanel());
          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));
}//Extra Class
package myPackage1;
import java.awt.GridLayout;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.JPanel;
import javax.swing.JSlider;
public class ExtraPanel extends JPanel implements
                                                       PropertyChangeListener
     private static final long serialVersionUID = 1L;
     public JPanel thisPanel;
     public TheSliderClass aPointer = new TheSliderClass();
     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 e)
          JSlider source = (JSlider)e.getSource();
          int fps = (int)source.getValue();
          System.out.println("Here  "+ fps);
}What i now does is that the method propertyChange is called but does not react to the slider being moved. It print "Here " + fps a number of times for each instance of the slider class, then it prints the initial values of fps and sits there even though the slider is being moved.
Help again
Thanks