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 ...

Many mistakenly assume that interfaces only sidestep Java’s failure to support multiple implementation inheritance. In reality, that workaround is only a side-effect of interface usage ...

Java's open inheritance model can feel like an open invitation to ... followed by the permits clause to explicitly name the classes that can extend or implement the sealed class or interface. Consider ...