Oval shape does not display

The oval shape I am trying to draw , does not display in the window.

Here is the code:

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package learn;

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JPanel;

/**
 *
 * @author skiabox
 */
public class Oval extends javax.swing.JFrame {
    
    
    
    /**
     * Creates new form Oval
     */
    public Oval() {
        initComponents();
        add(new NewPanel());
    }

    /**
     * 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() {

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 300, Short.MAX_VALUE)
        );

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

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /*
         * Set the Nimbus look and feel
         */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /*
         * If Nimbus (introduced in Java SE 6) is not available, stay with the
         * default look and feel. For details see
         * http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Oval.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Oval.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Oval.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Oval.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /*
         * Create and display the form
         */
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new Oval().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    // End of variables declaration                   
}


class NewPanel extends JPanel
{
    public void paintComponent(Graphics g)
    {
        g.setColor(getBackground());
        g.fillRect(0, 0, getWidth(), getHeight());
        g.setColor(Color.RED);
        g.fillOval(0, 0, getWidth(), getHeight());
    }
}

Open in new window



Any ideas guys?
Thank you.
skiaboxAsked:
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for_yanCommented:
This will work and shows Oval


/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
//package learn;

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JPanel;

/**
 *
 * @author skiabox
 */
public class Oval extends javax.swing.JFrame {



    /**
     * Creates new form Oval
     */
    public Oval() {
      //  initComponents();
         getContentPane().add(new NewPanel());
        setSize(200,200);
    }

    /**
     * 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() {

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 300, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>
       */
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /*
         * Set the Nimbus look and feel
         */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /*
         * If Nimbus (introduced in Java SE 6) is not available, stay with the
         * default look and feel. For details see
         * http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Oval.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Oval.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Oval.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Oval.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /*
         * Create and display the form
         */
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new Oval().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    // End of variables declaration
}


class NewPanel extends JPanel
{
    public void paintComponent(Graphics g)
    {
        g.setColor(getBackground());
        g.fillRect(0, 0, getWidth(), getHeight());
        g.setColor(Color.RED);
        g.fillOval(0, 0, getWidth(), getHeight());
    }
}

Open in new window

0
for_yanCommented:
this is how it looks like
(changed
 setSize(200,200);
to
 setSize(200,300);
otherwise it is a circle)
oval
0
for_yanCommented:
In the above code I removed all NetBeans stuf and just added your NewPanel to container
(in Swing you needd to add to getContentPane(). not to JFrame itself):
   getContentPane().add(new NewPanel());


If you  want
to do it with NetBeans GUI manger you need to add your custom elenment (class NewPanel)
to the pallette, see these links:

http://stackoverflow.com/questions/691890/reusing-a-jpanel-in-netbeans-gui-designer

http://wiki.netbeans.org/FaqFormUsingCustomComponent

http://stackoverflow.com/questions/816286/how-to-include-custom-panel-with-netbeans-gui-builder
0

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skiaboxAuthor Commented:
Is there any way I can use both NetBeans' generated code and

 getContentPane().add(new NewPanel());

Open in new window


?
I just tried this but I see no oval.
0
for_yanCommented:
look at my post ID: 37748392 and recommendations how to do it in the links there
0
for_yanCommented:
Better go away from this Netbeans GUI designer and create the components yourself - then you'll not depend on them and will be more flexible
0
skiaboxAuthor Commented:
Great links.
0
for_yanCommented:
I think this part froom this link should help you to add this your siubclass of JPanle:
http://wiki.netbeans.org/FaqFormUsingCustomComponent

To use a Swing component subclass without instantiating it in the GUI builder

    Use the Swing component ancestor in the GUI builder (e.g. JTable).
    Select the component, go to Properties window, select Code tab, Custom Creation Code property.
    Invoke the editor and enter java code you'd like to have to instantiate the subclass. E.g.: new MyTable();
    Note you can also define a full anonymous innerclass here.
0
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