In Chapter 7, Members Inheritance and Polymorphism, we worked with polymorphism. The next example doesn't represent a best practice because polymorphism is the way to make it work. However, we will write some code that doesn't represent a best practice just to understand a bit more about typecasting.
The following lines create a method called doSomethingWithWonderCat in JShell. We will use this method to understand how we can treat an instance received with an interface type as a different subclass. The code file for the sample is included in the java_9_oop_chapter_09_01 folder, in the example09_02.java file.
// The following code is just for educational purposes
// and it doesn't represent a best practice
// We should always take advantage of polymorphism instead
public void doSomethingWithWonderCat(WonderCat wonderCat) {
if (wonderCat instanceof HideableWonderCat) {
HideableWonderCat hideableCat = (HideableWonderCat...