Event Handler

In the declaration for the event handler class, code that specifies that the class either implements a listener interface or extends a class that implements a listener interface. For example:

public class MyClass implements ActionListener {
   ...
}

Code that registers an instance of the event handler class as a listener upon one or more components. For example:

someComponent.addActionListener(instanceOfMyClass);

Code that implements the methods in the listener interface. For example:

public void actionPerformed(ActionEvent e) {
    ...//code that reacts to the action...
}