Inheritance and composition are two programming ... sound a Cat makes: class Animal { void emitSound() { System.out.println("The animal emitted a sound"); } } class Cat extends Animal { @Override ...

We will focus on the relationship between polymorphism and Java inheritance ... public abstract class JavaMascot { public abstract void executeAction(); } public class Duke extends JavaMascot ...

You cannot prevent other developers from extending certain classes. A method might accept a specific type and its subclasses, but you want to restrict usage to a select few implementations of your own ...

If you're not familiar with object-oriented programming ... Animal class and force each object to define only the features that are different from the Animal class. Java uses the keyword extends ...