Help with tabbed pane

Question

hello!
i have a tabbed pane with two tabs.
in tab1 i have a button(for example), how can i do that when i press the button in tab1 it will draw something in tab2?
i tried to do this but it draw what i want in tab1(the tab with the button)
if the source code will help i will post it here
sorry for my bad english

Answer 1

here's something to play around with
(I've simplified it by putting it all in paintComponent, but it should be changed
to get the image, if not null then repaint)
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.net.URL;
import javax.imageio.ImageIO;
class Testing extends JFrame
  JTabbedPane tp = new JTabbedPane();
  JPanel p1 = new JPanel();
  MyJPanel p2 = new MyJPanel();
  public Testing()
    setSize(400,400);
    setLocation(300,200);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    JButton btn = new JButton("Set image");
    btn.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent ae){
        p2.imageFile = "Test.gif";
        p2.repaint();}});
    p1.add(btn);
    tp.addTab("Tab 1",p1);
    tp.addTab("Tab 2",p2);
    getContentPane().add(tp);
  public static void main(String[] args){new Testing().setVisible(true);}
class MyJPanel extends JPanel
  String imageFile = null;
  public void paintComponent(Graphics g)
    super.paintComponent(g);
    if(imageFile != null)
      try
        URL url = new URL(getClass().getResource(imageFile), imageFile);
        Image img = ImageIO.read(url);
        g.drawImage(img, 50,50,this);
      catch(Exception e){JOptionPane.showMessageDialog(null,"Image error");}
}