/* This class demonstrates inheritance and dynamic binding.
 * We create a generic vehicle class and then write 2 derived classes Car and Boat.
 * Then, we create an array of Vehicle objects and dynamically set each object of the array to Car or Boat, depending on the user's choice.
 */
import java.util.Scanner;
/* This class serves as the base class. It has 2 attributes, number of wheels, and color.
 * We write a default constructor, a parametrized constructor and accessor and mutator methods.
 * We also write a print method to print the details.
 */
class Vehicle
{
	//Data attributes. We make them protected so that the derived classes have access to them.
	protected int numWheels;
	protected String color;
	
	//constructors	
	public Vehicle()
	{
		numWheels = 4;
		color="blue";
	}
	public Vehicle(int n, String c)
	{
		numWheels= n;
		color =c;
	}
	
	//accessors
	public int getNumWheels()
	{
		return numWheels;
	}
	
	public String getColor()
	{
		return color;
	}
	//mutators
	public void setNumWheels(int n)
	{
		numWheels=n;
	}
	public void setColor(String c)
	{
		color=c;
	}
	//print method
	public void print()
	{
		System.out.println("Number of Wheels: "+getNumWheels() 
					+ "\nColor: "+ getColor());
	}
}
/* The Car class inherits from Vehicle. Thus, it already contains all the data attributes and the methods of the Vehicle class.
 * We add one more attribute - make. 
 * We write a default and a parametrized constructor, and accessor and mutator methods for the new attributes.
 * We override the print method to print information about the car objects.
 */
class Car extends Vehicle
{
	String make;
	public Car()
	{
		//super calls the constructors of the base class. It needs to be the first line of the method.
		super();
		make = "Toyota";
	}
	public Car(int n, String c, String m)
	{
		super(n,c);
		make =m;
	}
	
	public String getMake()
	{
		return make;
	}
	
	public void setMake(String m)
	{
		make =m;
	}
	//overriding the print method
	public void print()
	{
		System.out.println("Number of Wheels: "+getNumWheels() 
					+ "\nColor: "+ getColor()
					+ "\nMake: " +getMake());
	
	}
}
/* The Boat class inherits from Vehicle. Thus, it already contains all the data attributes and the methods of the Vehicle class.
 * We add one more attribute - hasSails. 
 * We write a default and a parametrized constructor, and accessor and mutator methods for the new attributes.
 * We override the print method to print information about the boat objects.
 */
class Boat extends Vehicle
{
	boolean hasSails;
	public Boat()
	{
		super();
		hasSails = true;
	}
	public Boat(int n, String c, boolean h)
	{
		super(n,c);
		hasSails = h;
	}
	
	public boolean getHasSails()
	{
		return hasSails;
	}
	
	public void setHasSails(boolean h)
	{
		hasSails=h;
	}
	
	public void print()
	{
		super.print(); // You can call the superclass's method in the overridden method.
		System.out.println("It has sails: "+getHasSails());
	
	}
}

class ManyVehicles
{
	public static void main(String[] args)
	{
		int N;
		Scanner input = new Scanner(System.in);
		System.out.print("Enter the number of objects: ");
		N=input.nextInt();
		//declare the array of base class objects.
		Vehicle [] vArray = new Vehicle [N];
		for(int i=0;i<N;i++)
		{
			//ask the user what kind of object they want to create 
			System.out.println("What kind? 1 - Car, 2- Boat: ");
			int choice = input.nextInt();
			if(choice == 1)
			{
				//user wanted a car
				System.out.print("Enter number of wheels: ");
				int n = input.nextInt();
				System.out.print("Enter color: ");
				String c = input.next();
				System.out.print("Enter make: ");
				String m = input.next();
				//dynamically create the Car object
				vArray[i] = new Car(n,c,m);
			}
			else if(choice == 2)
			{
				//user wanted a boat
				System.out.print("Enter number of wheels: ");
				int n = input.nextInt();
				System.out.print("Enter color: ");
				String c = input.next();
				System.out.print("Does it have sails?: ");
				boolean h = input.nextBoolean();
				//dynamically create the Boat object
				vArray[i] = new Boat(n,c,h);
			
			}
			else
			{
				System.out.println("Wrong choice entered.");
				i--;
			}
		}
		//just print the details
		for(int i=0;i<N;i++)
		{
			System.out.println("Vehicle number "+ (i+1));
			vArray[i].print();
		}
		
	}
}