Java tutorials

1. http://www.tutorialspoint.com/java/index.htm
2. http://learnjavaonline.org/en/Welcome
3. Event listeners - http://docs.oracle.com/javase/tutorial/uiswing/events/index.html
4. Designing a Swing GUI in NetBeans IDE - https://netbeans.org/kb/docs/java/quickstart-gui.html
! 5. The Java™ Tutorials - http://docs.oracle.com/javase/tutorial/index.html
6. LearnITGirl - https://www.learnitgirl.com/learning_materials/java

basic sources: Oracle, NetBeans