What are listeners in Java, what are its different types

Question

Need easy understandable meanings of listener and it's types

Answer 1

Listeners are simply objects that observe another object and run the specified method on a particular change of the object they're listening to.
As you can define your own listeners, it is not possible to provide a full list of what listeners an handle. But the most common use of them might be gui interaction, like handling mouse and keyboard events.

Answer 2

thanks Tashi