I am wondering where to learn the generic type and abstract class in java

Question

I try to learn it for robotic programming. Thanks a lot!

Answer 1

Java Abstract Classes
http://tutorials.jenkov.com/java/abstract-classes.html

https://www.baeldung.com/java-blogs

https://www.sololearn.com/post/43999/?ref=app

Answer 2

https://examples.javacodegeeks.com/java-basics/java-abstract-class-example/