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Editorial Team
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Asked: 2026-05-19T23:50:42+00:00

I am getting truble to repaint the JPanel in Gui builder can any body

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I am getting truble to repaint the JPanel in Gui builder can any body help me please.
here is main class that generate random Numbers in its Constructor 

public class Main {
public static int q;
public Main(){

     Random randomGenerator = new Random();
            for (int idx = 1; idx <= 10; ++idx) {
                q = randomGenerator.nextInt(100);
            }
}

here is button click event in class A that include JPanel as custom code

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
    new Main();
    Jpl jpl=new Jpl();   

}

Here is a class that add as custome component to class A

public class Jpl extends JPanel {

public Jpl() {
    printMe(Main.q);
}


public int printMe(int q) {
        removeAll();
    for (int i = 0; i <q; i++) {
        System.out.println("rinting lable");
        String htmlLabel = "<html><font color=\"#A01070\">" + i + " New Lable </font></html>";
        JLabel lbl = new JLabel(htmlLabel);
        setLayout(new GridLayout(0, 1));
        add(lbl, Jpl.RIGHT_ALIGNMENT);
        lbl.setForeground(Color.BLUE);
        Border border = BorderFactory.createLineBorder(Color.lightGray);
        lbl.setBorder(border);
        lbl.add(new JSeparator(SwingConstants.HORIZONTAL));

        lbl.addMouseListener(new MouseAdapter() {

            @Override
            public void mousePressed(MouseEvent e) {
                JLabel label = (JLabel) e.getSource();
                JOptionPane.showMessageDialog(null, "You Slected");
                System.out.println(label.getText() + "NO AKKA is Selected");
            }
        });
    }

    revalidate();
    repaint();
    return 1;

}
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1 Answer

  1. Editorial Team

    One problem: In your ActionListener code, you create a new JPanel (or Jpl) object: 

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
    Jpl jpl=new Jpl();
    int a= jpl.printMe(4);
}

    but there is absolutely no way that this is the Jpl object that is displayed in your GUI. Yes it is an object of the same class, but it is a completely new different and distinct object from the one being displayed, and so calling a method on it will have no effect on the displayed Jpl object. The solution is to call your methods only on the displayed object. I cannot tell you how to get a reference to that object since we are not privy to the rest of your code where you display it.

    The other problem is that you haven’t asked a question in this post, so I have no idea if my suggestion will help your primary problem (but I do know that it will solve a problem). So I suggest that you ask a proper question so we can better understand the issues and that you’ll likely need to post more code.

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