Adding a JPanel to a JFrame in Netbeans

Question

I created JFrame class in Netbeans and using generator I have add jPanel. I have also class, which extends JPanel. Now i want to create object of this class, and add him on the place where is my Panel in JFrame, but I can't find the right way, because all what I'm trying give no results

public static void main(String args[]) {
    
    java.awt.EventQueue.invokeLater(new Runnable() {

        public void run() {
            Frame f  = new Frame();
            jPanel1  = new MyPanel();
            f.pack();
            f.setVisible(true);
        }
    });

Ok, so maybe I will show more precise example what am I talking about:

first File:

class MyPanel extends javax.swing.JPanel {
public MyPanel() {
        initComponents();
        
    }
}

Another file, with Frame:

public class Frame extends javax.swing.JFrame {
public Frame() {
        initComponents();
}
public static void main(String args[]) {
        
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                Frame f  = new Frame();
                MyPanel p = new MyPanel();
                jPanel1 = p;
            }
        });
    }
private javax.swing.JButton jButton1;
private javax.swing.JPanel jPanel1;

And I want to set on the place of jPanel1 - object MyPanel

Solution 1

Your problem: Your MyPanel instance is not added to the main frame.

Solution: Add your MyPanel instance to the main frame's content pane.

Something like:

JFrame f  = new JFrame();
MyPanel jPanel1  = new MyPanel();
f.getContentPane().add(jPanel1  );
f.pack();
f.setVisible(true);

Solution 2

Above answers are correct - you need to actually add this MyPanel to the contentPane of the Frame.

Additionally you should probably use Swing instead of plain AWT. The code would look like this:

SwingUtilities.invokeLater(new Runnable() {

        @Override //annotation if you are using Java >= 1.5
        public void run() {
            JFrame f = new JFrame();
            MyPanel jPanel1 = new MyPanel();
            f.getContentPane().add(jPanel1);
            f.pack();
            f.setVisible(true);
        }
    });