Java Polymorphism

Many classes that are related to each other by inheritance.

• Each subclass inherit attributes and methods from superclass
• Subclasses also implement the methods in their own way

public interface Vegetarian{}
public class Animal{}
public class Deer extends Animal implements Vegetarian{}

Deer d = new Deer();
Animal a = d;
Vegetarian v = d;
Object o = d;

//All the reference variables d, a, v, o refer to the same Deer object in the heap.