Frame, Panel, Componant Formatting.

Question

My goal is to have a Frame that when it resizes the left and Right Panel take up 50% each and the Left panel should show a image that takes up the whole panel this is my Code:
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.FlowLayout;
import java.awt.Dimension;
public class MyFrame
    private JPanel myLeftPanel = null;
    private JPanel myRightPanel = null;
    private JFrame frame = null;
     public MyFrame(JPanel leftPanel, JPanel rightPanel)
         myLeftPanel = leftPanel;
         myRightPanel = rightPanel;
         makeFrame();
         addPanels();
     public void swapPanels(JPanel leftPanel, JPanel rightPanel)
         myLeftPanel = leftPanel;
         myRightPanel = rightPanel;
         addPanels();
     public void makeFrame()
         JFrame myFrame = new JFrame();
         frame = myFrame;
         frame.setSize(500, 500);
         frame.setTitle("Nasa Program");
         frame.setVisible(true);
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     public void addPanels()
         frame.getContentPane().setLayout(new FlowLayout());
         myLeftPanel.setPreferredSize(new Dimension(frame.getWidth()/2, frame.getHeight()));
         frame.getContentPane().add(myLeftPanel);
         frame.getContentPane().add(myRightPanel);
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JButton;
import javax.swing.JComponent;
import java.awt.*;
import java.io.IOException;
import java.net.MalformedURLException;
public class LeftPanelEarth extends JPanel
     public LeftPanelEarth()
         Image map = null;
          try {
               map = javax.imageio.ImageIO.read(new java.net.URL(getClass().getResource("calgary_small.gif"), "calgary_small.gif"));}
               catch (MalformedURLException mue) {       }
              catch (IOException ioe) {          }
         MapComponant mapPanel = new MapComponant(map);
         mapPanel.setPreferredSize(this.getSize());         /**                   REFERANCE POINT */
         this.add(mapPanel);
     public class MapComponant extends JComponent
         Image map = null;
         public MapComponant (Image mapGiven)
             map = mapGiven;
     public void paintComponent(Graphics g)
         Graphics2D g2 = (Graphics2D) g;
               if (map != null)
                    g2.drawImage(map,
                              0,
                              0,
                              getWidth(),
                              getHeight(),
                              this);
}And the Right Panel just has a Button that does appear.
So what I end up with is that I get a frame with the left side empty and the Right side with the button. If i replace the "REFERANCE POINT" above with values such as new Dimension(200,200) the image will appear on the left side but It is not drawn in the (0,0) part of the Panel like it is soppose to.
So I can't get the Image to take the intire Panel up and When I give it a Dimension it dosent draw it at (0,0) anyone know whats going on?
Frame>2Panels (Left Panel is given Dimension (Frame/2, Frame))>Image is given(Dimension (Panel, Panel))
I dunno why it isn't woking.

Answer 1

try this
import javax.swing.*;
import java.awt.*;
class MyFrame
    private JPanel myLeftPanel = null;
    private JPanel myRightPanel = null;
    private JFrame frame = null;
  public MyFrame(JPanel leftPanel, JPanel rightPanel)
      myLeftPanel = leftPanel;
      myRightPanel = rightPanel;
      makeFrame();
      addPanels();
      frame.setVisible(true);//moved to here
  public void makeFrame()
      JFrame myFrame = new JFrame();
      frame = myFrame;
      frame.setSize(500, 500);
      frame.setTitle("Nasa Program");
      //frame.setVisible(true);
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  public void addPanels()
      //frame.getContentPane().setLayout(new FlowLayout());
      frame.getContentPane().setLayout(new GridLayout(1,2));
      myLeftPanel.setPreferredSize(new Dimension(frame.getWidth()/2, frame.getHeight()));
      frame.getContentPane().add(myLeftPanel);
      frame.getContentPane().add(myRightPanel);
  public static void main(String[] args){new MyFrame(new LeftPanelEarth(),new RightPanel());}
class LeftPanelEarth extends JPanel
   Image img;
  public LeftPanelEarth()
    try
      img = javax.imageio.ImageIO.read(new java.net.URL(getClass().getResource("Test.gif"), "Test.gif"));
    catch(Exception e){}//do nothing
  public void paintComponent(Graphics g)
    super.paintComponent(g);
    if(img != null) g.drawImage(img, 0,0,this.getWidth(),this.getHeight(),this);
class RightPanel extends JPanel
  public RightPanel()
    super(new GridBagLayout());
    add(new JButton("OK"),new GridBagConstraints());
}