Compare inheritance and composition, the two fundamental ways to relate Java classes, then practice debugging ClassCastExceptions in Java inheritance.

Get started with polymorphism in Java and how to do method invocation in polymorphic method calls.

Sealed classes in Java let developers limit the creation and use of subclasses and preserve the class hierarchy. Here is how sealed classes in Java work.

A good working definition of safety-critical Java code is that it issoftware that must be certified according to DO-178B or equivalentguidelines.