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 ...

Instead, Java’s designers chose to allow multiple interface inheritance through the use of interfaces, an idea borrowed from Objective C’s protocols.

How does the open-closed SOLID principle work in a Java program? Here we show you what this important principle means, and how to implement the open-closed principle in Java.