Re: Show the most recent image, display only it.

Andrew Thompson <>
Fri, 29 Aug 2008 22:20:10 -0700 (PDT)
On Aug 30, 2:50 pm, bH <> wrote:

Hi All,
This is a demo program only of my problem.

I am still not sure I understand what you want,
but if that is 'only ever one image on-screen',
you might do it this way.

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;

import javax.imageio.*;



public class GDP extends JFrame
  implements ActionListener {

// private Icon myImage = new ImageIcon();
  private JButton b1 = new JButton("Get Drawing");
  private JButton b2 = new JButton("Drawing is >>>");
  private JButton b3= new JButton("Close");
  private Boolean counterFlag = false;
  private BufferedImage image;

  /** We keep a reference to a single JLabel, and
  reuse it for each icon. */
  JLabel label;

  public static void main(String[] args){
    new GDP ().go();
  void go()
    JPanel labelPanel = new JPanel();
    JPanel btnPanel = new JPanel();

    Container contentPane= getContentPane();
    contentPane.setLayout( new FlowLayout() );
    contentPane.add(btnPanel );

  public void actionPerformed(ActionEvent e) {
    String udp1 = ""+
    String udp2 = ""+
    String udp = "";
    if(e.getSource() == b1){
      try {
        if(counterFlag == false){
          udp = udp1;
          udp = udp2;
        URL url = new URL(udp);
        image =;
        counterFlag = true;
      catch (IOException em) {
        System.out.println("import Data: I/O exception");
        ("Now press Drawing Is >>> if you want to see it");

    } //end b1
    if(e.getSource() == b2){
      Image img = image ;
      if (label==null) {
        label = new JLabel(new ImageIcon(img)) ;
          getContentPane().add(label) ;
    } else {
      label.setIcon(new ImageIcon(img)) ;
      setVisible( true );

    } //end b2

    if(e.getSource() == b3){

    } //end b3
  } // action draw picture

Andrew Thompson

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