class Rectangle { int height; int width ... To write SOLID code, and properly implement the Liskov substitution principle in Java, your code must be philosophically and behaviorally compliant as well.

Consider the following example: switch (shape) { case Triangle t -> System.out.println(t + " is a Triangle"); case Rectangle r when ... In this improved code, we've replaced explicit type declarations ...

In Java, polymorphism results in code that is more concise and easier to maintain. This tutorial provides an overview of the four types of Java polymorphism, but our focus is subtype polymorphism.