HELP, most probably a very simple solution!

Question

I can compile the following file but I can't get it to run. I know something very simple is needed but I am still learning this java business and am currently brain dead. Please help as this is quite important for me! Any advice is much appreciated, thanks. It is basically meant to be a program to give co-ordinates in a JPanel etc... Please don't abuse me for not understanding!!! lol
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
//import com.borland.jbcl.layout.*;
public class Picker extends JPanel
     String imageFile = "Images/knob.jpg";
     // Create JPanel and set the dimensions so that the crosshairs go in the right place
     Image img = Toolkit.getDefaultToolkit().getImage(imageFile);
     JPanel hSPickerPanel = new JPanel()
          public Dimension getPreferredSize(){return new Dimension(100, 100);}
          public Dimension getMaximumSize(){return getPreferredSize();}
          public Dimension getMinimumSize(){return getPreferredSize();}
          //PaintComponent method for this JPanel Component. Each component needs
          //its own so that each can be redrawn.
          public void paintComponent(Graphics g)
               super.paintComponent(g);
               //     Graphics2D g2D = (Graphics2D)g;
               g.setClip(0, 0, getSize().width, getSize().height);
               // g2D.drawImage(BC, null, 0, 0);
               g.setXORMode(Color.WHITE);
               //Problem.
               // Draws the cross relating to the coordinates of the whole JPanel.
               // Not hSPickerPanel. Sorted. 01/08/03. each panel wants to have its
               //own paintComponent method.
               g.drawImage(img, xCoord, yCoord,15,15,this);
               // g.drawOval(xCoord, yCoord, 15, 15);
               //g.fillOval(xCoord, yCoord, 15,15);
               // g.drawLine(xCoord + 10 , yCoord,xCoord - 10 , yCoord);
               // g.drawLine(xCoord, yCoord + 10, xCoord, yCoord - 10);
               g.drawString(String.valueOf(xCoord) + ":" + String.valueOf(100 - yCoord), 54, 47);
     JLabel HueSatTitleLabel = new JLabel();
     JLabel hueSatLabel = new JLabel();
     int xCoord = 50;
     int yCoord = 50;
     String coordinates;
     String xString;
     String yString;
     GridBagLayout gridBagLayout1 = new GridBagLayout();
     JButton jButton1 = new JButton();
     public Picker()
          try
               jbInit(); // calls the method below that adds the button to 'this'
          catch(Exception e)
               e.printStackTrace();
     //dddddddddddddddddddddddddddddddddddddddddddddddddddddddd
     // BrtnsCtrstPckrPnl = new JPanel() creates JPanel.
     //     public void paintComponent(Graphics g)
     /*     super.paintComponent(g);
               Graphics2D g2D = (Graphics2D)g;
               g2D.setClip(0, 0, getSize().width, getSize().height);
               // g2D.drawImage(BC, null, 0, 0);
               g2D.setXORMode(Color.WHITE);
               g2D.drawLine(xCoord - 10, yCoord, xCoord + 10, yCoord);
               g2D.drawLine(xCoord, yCoord - 10, xCoord, yCoord + 10);
               g2D.drawString(String.valueOf(xCoord) + ":" + String.valueOf(100 - yCoord), 54, 47);
     /*          super.paintComponent(g);
               //     Graphics2D g2D = (Graphics2D)g;
                         g.setClip(0, 0, getSize().width, getSize().height);
                         // g2D.drawImage(BC, null, 0, 0);
                         g.setXORMode(Color.WHITE);
                         g.drawLine(xCoord + 10 , yCoord,xCoord - 10 , yCoord);
                         g.drawLine(xCoord, yCoord + 10, xCoord, yCoord - 10);
                         g.drawString(String.valueOf(xCoord) + ":" + String.valueOf(100 - yCoord), 54, 47);
     //ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
     private void jbInit() throws Exception
          this.setLayout(gridBagLayout1);
          hSPickerPanel.setBorder(BorderFactory.createEtchedBorder());
          HueSatTitleLabel.setBorder(BorderFactory.createEtchedBorder());
          HueSatTitleLabel.setText("Hue & Saturation");
          hueSatLabel.setBorder(BorderFactory.createEtchedBorder());
          xString = Integer.toString(xCoord);
          yString = Integer.toString(yCoord);
          coordinates = xString +" : "+ yString;
          hueSatLabel.setText(coordinates);
          hSPickerPanel.addMouseListener(new MouseAdapter()
                    public void mouseReleased(MouseEvent e)
                         xCoord = Math.max(Math.min(e.getX(), 100), 0);
                         yCoord = Math.max(Math.min(e.getY(), 100), 0);
                         displayCoordinates(xCoord,yCoord);
                         hSPickerPanel.repaint();
                    public void mousePressed(MouseEvent e)
                         xCoord = Math.max(Math.min(e.getX(), 100), 0);
                         yCoord = Math.max(Math.min(e.getY(), 100), 0);
                         displayCoordinates(xCoord,yCoord);
                         hSPickerPanel.repaint();
          hSPickerPanel.addMouseMotionListener(new MouseMotionAdapter()
                    public void mouseDragged(MouseEvent e)
                         xCoord = Math.max(Math.min(e.getX(), 100), 0);
                         yCoord = Math.max(Math.min(e.getY(), 100), 0);
                         displayCoordinates(xCoord,yCoord);
                         hSPickerPanel.repaint();
          //Add components to Back Panel (this)
          this.setMaximumSize(new Dimension(118, 165));
          this.setMinimumSize(new Dimension(118, 165));
          jButton1.setText("Reset");
          jButton1.addActionListener(new java.awt.event.ActionListener() {
                    public void actionPerformed(ActionEvent e) {
                         jButton1_actionPerformed(e);
          this.add(hSPickerPanel, new GridBagConstraints(0, 1, 2, 1, 1.0, 1.0
               ,GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 3, 0, 0), 101, 102));
          this.add(HueSatTitleLabel, new GridBagConstraints(0, 0, 2, 1, 0.0, 0.0
               ,GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(2, 3, 0, 0), 30, 1));
          this.add(hueSatLabel, new GridBagConstraints(0, 2, 1, 1, 0.0, 0.0
               ,GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 3, 5, 0), 4, 3));
          this.add(jButton1, new GridBagConstraints(1, 2, 1, 1, 0.0, 0.0
               ,GridBagConstraints.EAST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 3, 0));
     public void displayCoordinates(int x, int y)
          xString = Integer.toString(x);
          yString = Integer.toString(y);
          coordinates = xString +" : "+ yString;
          hueSatLabel.setText(coordinates);
     void jButton1_actionPerformed(ActionEvent e)
          xCoord = 50;
          yCoord = 50;
          displayCoordinates(xCoord, yCoord);
          hSPickerPanel.repaint();

Answer 1

Use a URL object to locate your image instead of a string. To do that, import the java.net.* library and create a URL object for your image:
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
//import com.borland.jbcl.layout.*;
import java.net.*;
public class Picker extends JPanel
    //String imageFile = "Images/knob.jpg";
    Class cl = ((Picker) this).getClass();
    URL imageURL=cl.getResource("Images/knob.jpg");
    // Create JPanel and set the dimensions so that the crosshairs go in the right place
    Image img = Toolkit.getDefaultToolkit().getImage(imageURL);
    JPanel hSPickerPanel = new JPanel()
}To view your Panel, you have to add a "main" method and create a frame to display your panel:
public class Picker extends JPanel
    void jButton1_actionPerformed(ActionEvent e)
    public static void main(String[] args)
     Picker p=new Picker();
     JFrame frame=new JFrame("Picker Example");
     frame.getContentPane().add(p);
     frame.setVisible(true);
     frame.pack();
}You can see your panel by:
- compiling: javac Picker.java
- and running your application with the "main" method: java Picker