JFrame and actionlistener jpanel

Question

In the main class's constructor i have this actionlistener attached to a button:

home.addActionListener(new ActionListener(){
    @Override
    public void actionPerformed(ActionEvent e) {
        Home homepage = new Home();
        homepage.setBounds(0, 100, 500, 400);
        add(homepage);

    }
});

This is the Home class:

package test;

import javax.swing.JButton;
import javax.swing.JPanel;

public class Home extends JPanel{

    public Home(){
        JButton jb = new JButton("Back");
        add(jb);
    }
}

The jb button doesn't show up on the jframe... can you help me out?

EDIT: It's actually there but you need to mouse over it to see it ... how can we request focus? like i do jb.requestFocus() and you still need to mouse over it.

Answer 1

When adding components dynamically, you need to revalidate() and repaint()

   add(homepage);
   revalidate();
   repaint();

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Side Note: Have a look at Laying out Components withing a Container to learn how to use layout managers. They are preferred over using null layouts, as you are doing.