Polymorphism in Java

Polymorphism in Java Tutorial

What is Inheritance in Java | Lecture | Tutorial

Лекция "Харизматичный оратор: энергетика выступления". Robinzon.TV

Inheritance and polymorphism -> examples

Inheritance
https://gist.github.com/MykolaBova/7c53b2bad0ee834e3148480c1f5a94b0

Override
https://gist.github.com/MykolaBova/663e45b04baff0d281ca06ccc7c186da

Hide Instance Variable
https://gist.github.com/MykolaBova/ae88bc20ea199d2d545d0a05d5580ca3

java online ide

1)
http://ideone.com/XVDx1B

2)
http://www.browxy.com/

3)
https://www.codechef.com/ide