ActionListener.actionPerformed(ActionEvent e) has the following syntax.
void actionPerformed(ActionEvent e)
In the following code shows how to use ActionListener.actionPerformed(ActionEvent e) method.
//from w ww . jav a 2s . c o m import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; class ButtonListener implements ActionListener { ButtonListener() { } public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equals("Button1")) { System.out.println("Button1 has been clicked"); } } } public class Main extends JPanel { public Main() { JButton btn1 = new JButton("Button1"); btn1.addActionListener(new ButtonListener()); add(btn1); } public static void main(String[] args) { JFrame frame = new JFrame(); frame.getContentPane().add(new Main()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(200, 200); frame.setVisible(true); } }