You might find these following videos helpful :-)
Introduction to Java playlist: https://goo.gl/3Bw2FU
Java Class and Objects Playlist: https://goo.gl/PwR73w
Java Encapsulation Playlist: https://goo.gl/zkshwf
Java This Keyword + return object from methods: https://goo.gl/mFRr2a
Java Bitwise Operator: https://goo.gl/vDRuWs
Java Abstract Class + Interface Playlist: https://goo.gl/8sBywa
Java Inheritance in Bangla Playlist: https://goo.gl/trreje
Java Super Keyword: https://goo.gl/YpKIlm
Java Exception Handling Playlist: https://goo.gl/5jqUS6
Java Static Keyword Playlist: https://goo.gl/IxkCoM
Java Multithreading: https://goo.gl/5mXDYN
C++ STL: https://goo.gl/s1Jdwp
