We will focus on the relationship between polymorphism and Java inheritance. The main thing to keep in mind is that polymorphism requires an inheritance or an interface implementation. You can see ...

Jeff Friesen. Figure 1. A pair of inheritance hierarchies are rooted in the common vehicle category. Single inheritance and multiple inheritance. The example in Figure 1 illustrates single ...

Sealed classes make Java an even more powerful and expressive language and set the stage for even more sophisticated techniques such as pattern matching, which we'll explore in a subsequent article. A ...