adding components dynamically in a JPanel

how can i add components dynamically in a jpanel? I am having add button when i click the button the components should be added to the JPanel.

my question is that adding a textfield and button to jpanel when i click on the add button the user can click on the add button any number of times according to that i have to add them to the jpanel. i have added to sc开发者_如何学编程rollerpane to my jpanel,and jpanel layout manager is set to null.

Just as you always do, except that you have to call:

panel.revalidate();

when you are done, since the container is already realized.

Use an ActionListener, you can use an anonymous class like this:

JPanel myJPanel = new JPanel();

...

b = new Button("Add Component");
b.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        JLabel someLabel = new JLabel("Some new Label");
        myJPanel.add(someLabel);
        myJPanel.revalidate();
    }
});