Example with both overloading overriding method

Animal.java

package polymorphism.overloadingAndoverriding;

public class Animal {
	public void eat() {
        System.out.println("Generic Animal Eating Generically");
     }
}

Horse.java

package polymorphism.overloadingAndoverriding;

public class Horse extends Animal {
	// Horse class has both overloaded and overridden the eat() method.
	public void eat() {
		System.out.println("Horse eating hay ");
	}

	public void eat(String s) {
		System.out.println("Horse eating " + s);
	}

	public static void main(String[] args) {
		Animal a = new Animal();
		a.eat(); // Generic Animal Eating Generically

		Horse h = new Horse();
		h.eat();// Horse eating hay

		Animal ah = new Horse();
		ah.eat();// Horse eating hay
		// Polymorphism works—the actual object type (Horse), not the reference
		// type (Animal), is used to determine which eat() is called.

		Horse he = new Horse();
		he.eat("Apples");// Horse eating Apples
		// The overloaded eat(String s) method is invoked.

		Animal a2 = new Animal();
		// a2.eat("treats");//Compiler error! Compiler sees that Animal class
		// doesn't have an eat() method that takes a String.

		Animal ah2 = new Horse();
		// ah2.eat("Carrots");//Compiler error! Compiler still looks only at the
		// reference, and sees that Animal doesn’t have an eat() method that
		// takes a String. Compiler doesn’t care that the actual object might be
		// a Horse at runtime.
	}
}