Listeners and Events

Some listeners and events links:

how do listeners work

http://www.javaworld.com/article/2077351/java-se/events-and-listeners.html

http://www.softcoded.com/web_design/java_listeners.php

https://guides.codepath.com/android/Creating-Custom-Listeners

custom listener to manage callbacks

http://www.tutorialspoint.com/android/android_event_handling.htm

http://beginwithjava.blogspot.in/2009/01/listeners-can-java-hear-you.html

is there a listener in java

http://www.javaworld.com/article/2077351/java-se/events-and-listeners.html

https://docs.oracle.com/javase/tutorial/uiswing/events/intro.html

http://stackoverflow.com/questions/7510532/what-is-the-purpose-of-a-listener-class-in-a-large-project

https://en.wikipedia.org/wiki/Observer_pattern