Error: javax.swing.AbstractButton cannot be applied to...

[barney]

Hi, iv written a program which has a JtabbedPane GUI but the problem is on one of my tabs i have a JPanel called panel1. on panel1 i have a button called addButton now i add this button onto my panel and my panel onto the tab using the following code:

panel1.add(addButton);
tabbedPane.addTab("New Booking", null, panel1, "First Panel");

which works just fine and when compiled you see the tabs and the button on the first pane.

but then when i try and ad an actionlistener to the button using the following code

  addButton.addActionListener(this);

i get this error:

addActionListener(java.awt.event.ActionListener) in javax.swing.AbstractButton cannot be applied to (tester) 
tester is the name of my class.

Thanks

[hardwired]

tester must implement ActionListener and have its only method implemented:

class tester implements ActionListener {
    ...
    public void actionPerformed(ActionEvent e) {

    }
    ...
}

in order to be a proper ActionListener for addButton.