Events, Event Sources, and Event Listeners

• Example: Use JButton components for buttons; attach an ActionListener to each button
• ActionListener interface:

  public interface ActionListener
  {
     void actionPerformed(ActionEvent event);
  }

• Need to supply a class whose actionPerformed method contains instructions to be executed when button is clicked
• event parameter contains details about the event, such as the time at which it occurred
• Construct an object of the listener and add it to the button:

  ActionListener listener = new ClickListener();
  button.addActionListener(listener);