43_Dynamic Polymorphism

//polymorphism = many shapes/forms
//dynamic = after compilation (during runtime)
//ex. A corvette is a: corvette, and a car, and a vehicle, and an object
        
        
<Main.java>
import java.util.Scanner;
public class Main{
    public static void main(String[] args) {
       Scanner scanner = new Scanner(System.in);
        Animal animal;
        System.out.println("What animal do you want?");
        System.out.print("(1=dog) or (2=cat):");
        int choice = scanner.nextInt();

        if(choice==1){
            animal = new Dog();
            animal.speak();
        }else if(choice==2){
            animal = new Cat();
            animal.speak();
        }else{
            animal = new Animal();
            System.out.println("That choice was invalid");
            animal.speak();
        }
    }
}

<Animal.java>
public class Animal {
    public void speak() {
        System.out.println("animal goes *brrrr*");
    }
}

<Dog.java>
public class Dog extends Animal {
    @Override
    public void speak() {
        System.out.println("dog goes *bark*");
    }
}

<Cat.java>
public class Cat extends Animal {
    @Override
    public void speak(){
        System.out.println("cat goes *meow*");
    }
}

>>
What animal do you want?
(1=dog) or (2=cat): >>3
>> That choice was invalid
cat goes *brrrr*