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import java.awt.BorderLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent ae) {
Toolkit.getDefaultToolkit().beep();
}
}
public class UseActionListener {
public static void main(String[] a) {
JFrame frame = new JFrame("Popup JComboBox");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton source = new JButton("Ring the bell!");
source.addActionListener(new ButtonListener());
frame.add(source, BorderLayout.SOUTH);
source.addActionListener(new ButtonListener());
frame.setSize(300, 200);
frame.setVisible(true);
}
}
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