What is an exception in Java and how is it handled?

Polymorphism in Java is the ability of a variable, function, or object to take multiple forms. It is primarily implemented through inheritance and interfaces.

For example:

public class Animal {
    public void makeSound() {
        System.out.println("Animal sound");
    }
}
 
public class Dog extends Animal {
    @Override
    public void makeSound() {
        System.out.println("Woof");
    }
}
 
public class Cat extends Animal {
    @Override
    public void makeSound() {
        System.out.println("Meow");
    }
}
 
public class TestPolymorphism {
    public static void main(String[] args) {
        Animal myAnimal = new Dog();
        myAnimal.makeSound(); // Outputs: Woof
        
        myAnimal = new Cat();
        myAnimal.makeSound(); // Outputs: Meow
    }
}

What is an exception in Java and how is it handled?What are abstract classes and interfaces in Java? When should you use one over the other?