Ahmed Abdelalem’s Reviews > Head First Java > Status Update

risky behaviour and dealing with Exceptions

object life and death (instance and local var) stack and heaps

multiple inheritance with Deadly Diamond of Death and interface

polymorphism, casting, and its relation with reference Type dealing with object Type.

general talks about inheritance and polymorphism
with good notes on points, someone may make mistakes to take care of.

the author talks about how the ArrayList is important in some situations and proved that with a simple game he made in the chapter before

prep code is like sketching on papers then the idea of writing tests iteratively every time then doing the implementation details is also easy to develop and design

how JVM work with their non primitive (reference Objects)