How can I load an image from a URl,display it in another class without freezing the c

**phpuser123** · Dec 26 '10, 08:22 AM

I have a class test2 containing a button.When I press this button, I want to instantiate an object from Test3 and display the image in a panel on the newly created object..

test2 class

Code:

public class test2 extends javax.swing.JFrame {

    /** Creates new form test2 */
    public test2() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jButton1 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton1.setText("jButton1");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(160, 160, 160)
                .addComponent(jButton1)
                .addContainerGap(167, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(228, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addGap(49, 49, 49))
        );

        pack();
    }// </editor-fold>

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
            String url="http://www.flash-slideshow-maker.com/images/help_clip_image004.jpg";
            System.out.append("Loadiiing ....");
            Test3 t=new Test3(url);// TODO add your handling code here:
    }

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new test2().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    // End of variables declaration

}

Test3 class

Code:

public class Test3 extends javax.swing.JFrame {

    /** Creates new form Test3 */
    public Test3(String url) {
        initComponents();
        try {
            System.out.append("Loadiiing 1....");
            displayMap(url, jPanel1, new JLabel());
            System.out.append("Loaded2.......... ....");
        } catch (MalformedURLException ex) {
            Logger.getLogger(Test3.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

  
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 359, Short.MAX_VALUE)
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 268, Short.MAX_VALUE)
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(20, 20, 20)
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(21, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(21, 21, 21)
                .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>

   
     private void displayMap(String url,JPanel panel,JLabel label) throws MalformedURLException{
        URL imageurl=new URL(url);
        Image image=(Toolkit.getDefaultToolkit().createImage(imageurl));
        ImageIcon icon = new ImageIcon(image);
        label.setIcon(icon);
        panel.add(label);
       // System.out.println(panel.getSize().width);
        this.getContentPane().add(panel);
    }
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
              //  new Test3().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JPanel jPanel1;
    // End of variables declaration

}

My output:

Loadiiing ....Loadiiing 1....

When I press the jButton1, the test2 from freezes until the image loads.Are there alternative solutions to do this?