/*
 * An abstract class should have atleast one abstract method
 * It can have non abstract methods also unlike interfaces
 * Abstract methods cannot be instantiated
 * Child classes of an abstract class can of-course be instantiated, and if the abstract class has a constructor, then child class on instansiation
 * will call the abstract class instance first and then will call the child class constructor
 * An abstract class non abstract methods are always static, as the abstract class cannot be instantiated, and therefore if these methods are not static,
 * they wont be able to be directly called from abstract class name
 * Abstract class abstract methods should not be static, as they have to be implemented by child class who calls these methods through object
 * instance of child class of type parent (Abstract class)
 * Non abstract methods of an abstract class can be overridden by child classes and that method overridden can be called by child class objects
 * Interesting one (for me to check more as well) - Child class object can call static methods with bodies implemented in abstract classes directly by
 * instance of child class (need to see this, as child class should ideally not be able to call static methods with an instance)
 */
public abstract class AbstractClass {

	public AbstractClass() {
		System.out.println("Abstract Class Constructor");
	}

	//Declare abstract methods of the abstract class
	public abstract void add(Integer a, Integer b);
	public abstract void subtract(Integer a, Integer b);


	public void introduce() {
		System.out.println("This class is an abstract class");
		System.out.println("My name is Rajat, we are beginning to learn JAVA's abstract classes");
	}

}