Resizing JFrame on button click to show an image on the JFrame

Question

Dear All,
I have a JFrame which has an empty label. On button click I want to set an icon for the label and want the JFrame to be resized to show that icon. I am using frame.pack() and I am not using any other sizing function. The code that I have right now, prints the image on the panel, but does not resize the frame to show the image. Pleae could someone help.package gui;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class ComponentDemo extends JPanel implements ActionListener,
ItemListener, MouseListener, KeyListener {
     private JTextArea textarea;
     private JButton button;
     private final static String newline = "\n";
     private JLabel imageIcon;
     public ComponentDemo() {
          button = new JButton("JButton welcomes you  to CO2001");
          button.addActionListener(this);
          add(button);
          textarea = new JTextArea(10, 50);
          textarea.setEditable(false);
          addMouseListener(this);
          textarea.addKeyListener(this);
          JScrollPane scrollPane = new JScrollPane(textarea);
          add(scrollPane);
          imageIcon = new JLabel();
          add(imageIcon);
          setBackground(Color.pink);
          new JScrollPane(this);
      * Create the GUI and show it. For thread safety, this method should be
      * invoked from the event-dispatching thread.
     private static void createAndShowGUI() {
          // Create and set up the window.
          JFrame frame = new JFrame("Simple FrameDemo");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
          frame.setLocation(700, 200);
          // get the content pane and set the background colour;
          frame.add(new ComponentDemo());
     //     frame.setSize(screenSize);
          // frame.getContentPane().setBackground(Color.cyan);
          // Display the window.
          frame.pack();
          frame.setVisible(true);
          frame.setResizable(true);
     public static void main(String[] args) {
          // Schedule a job for the event-dispatching thread:
          // creating and showing this application's GUI.
          javax.swing.SwingUtilities.invokeLater(new Runnable() {
               public void run() {
                    createAndShowGUI();
     @Override
     public void actionPerformed(ActionEvent e) {
          // TODO Auto-generated method stub
          if (e.getSource() instanceof JButton) {
               // System.out.println(e.getSource());
               String text = ((JButton) e.getSource()).getText();
               textarea.append(text + newline);
               textarea.setBackground(Color.cyan);
               textarea.setForeground(Color.BLUE);
               textarea.setCaretPosition(textarea.getDocument().getLength());
               imageIcon.setIcon(createImageIcon("SwingingDuke.png",
               "Image to be displayed"));
     @Override
     public void itemStateChanged(ItemEvent arg0) {
          // TODO Auto-generated method stub
     @Override
     public void mouseClicked(MouseEvent arg0) {
          textarea.append("A Mouse click welcomes you to CO2001" + newline);
          textarea.setBackground(Color.green);
          textarea.setCaretPosition(textarea.getDocument().getLength());
     @Override
     public void mouseEntered(MouseEvent arg0) {
          // TODO Auto-generated method stub
     @Override
     public void mouseExited(MouseEvent arg0) {
          // TODO Auto-generated method stub
     @Override
     public void mousePressed(MouseEvent arg0) {
          // TODO Auto-generated method stub
     @Override
     public void mouseReleased(MouseEvent arg0) {
          // TODO Auto-generated method stub
     @Override
     public void keyPressed(KeyEvent e) {
          System.out.println(e.getKeyChar());
          textarea.append("The key " + e.getKeyChar()
                    + " click welcomes you to CO2001" + newline);
          textarea.setBackground(Color.YELLOW);
          textarea.setFont(new Font("Arial", Font.ITALIC, 16));
          textarea.setCaretPosition(textarea.getDocument().getLength());
     @Override
     public void keyReleased(KeyEvent e) {
          System.out.println(e.getKeyChar());
          // textarea.append("The key "+
          // e.getKeyChar()+" click welcomes you to CO2001" + newline);
          // textarea.setBackground(Color.green);
          // textarea.setCaretPosition(textarea.getDocument().getLength());
     @Override
     public void keyTyped(KeyEvent e) {
          // TODO Auto-generated method stub
          System.out.println(e.getKeyChar());
          // textarea.append("The key "+
          // e.getKeyChar()+" click welcomes you to CO2001" + newline);
          // textarea.setBackground(Color.blue);
          // textarea.setCaretPosition(textarea.getDocument().getLength());
     /** Returns an ImageIcon, or null if the path was invalid. */
     protected ImageIcon createImageIcon(String path, String description) {
          java.net.URL imgURL = getClass().getResource(path);
          if (imgURL != null) {
               System.out.println("found");
               return new ImageIcon(imgURL, description);
          } else {
               System.err.println("Couldn't find file: " + path);
               return null;
}

Answer 1

myJPanel.setPerferredSize(new Dimension(new_width, new_hight));
myJFrame.pack();