The event source notifies event listeners by invoking a particular method of the event listener (aka the event handler method) and passing it an Event object, which has all the information about the event.
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public class EventClass implements ActionListener
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{
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public void actionPerformed ( ActionEvent ev )
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{. . . put code here to respond to event ev . . . }
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}
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Each basic component has a defined Event class, Listener interface, and event handling method names.
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Note that an interface is a class in which there are headers of methods with no method body. It just gives the name(s) of methods such as actionPerformed that the user is to provide.
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