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Add component on JFrame during runtime

Source code below will show you how to add a component into a JFrame during program runtime. Component that will be use in this program, is JButton.

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COMPLETE SOURCE CODE FOR : AddComponentOnJFrameAtRuntime.java
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import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JPanel;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import java.awt.FlowLayout;
import java.awt.BorderLayout;

public class AddComponentOnJFrameAtRuntime extends JFrame implements ActionListener
{
JPanel panel;

public AddComponentOnJFrameAtRuntime()
{
super("Add component on JFrame at runtime");
setLayout(new BorderLayout());
panel=new JPanel();
panel.setLayout(new FlowLayout());
add(panel,BorderLayout.CENTER);
JButton button=new JButton("CLICK HERE");
add(button,BorderLayout.SOUTH);
button.addActionListener(this);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(500,500);
setVisible(true);
}

public void actionPerformed(ActionEvent evt)
{
panel.add(new JButton("Button"));
panel.revalidate();
validate();
}

public static void main(String[]args)
{
AddComponentOnJFrameAtRuntime acojfar=new AddComponentOnJFrameAtRuntime();
}
}


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JUST COMPILE AND EXECUTE IT
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