What is the purpose of a listener in Java?

Question

I looked for this online, but couldn\'t find an adequate explanation to what it exactly does. What I saw was a Java Interface and it was passed as a parameter in another cla

Answer 1

Listeners do some work when an event occurs. They are called as "Event Listeners". Events like click, hover etc.. For Example, we have ActionListener interface in Java. It calls actionPerformed() method when an event occurs. You can refer http://java.about.com/od/a/g/Actionlistener.htm for more info.