BookShop

//A program to show inheritance in the form of a BookShop

class Publication
{
	String title;
	double price;

//Constructor of Publication with parameters
    public Publication(String title, double price)
    	{
		this.title=title;
		this.price=price;
	}
	public void display()
	{
		System.out.println("The Title of the Book: " + title);
		System.out.println("The price of the Book: " + price);
	}
}

//Making Child class Book of parent class Publication which is also implementing interface Sales
class Book extends Publication implements Sales
{
	int count;
	static double sales;

//Constructor of Book with parameters
	public Book(String title,double price,int count)
	{
		super(title,price);
		this.count=count;
	}

	//Display function
	public void display()
	{
		super.display();
		System.out.println("Number of pages are: "+count);
	}

//Function for Sales
	public void InputSales()
	{
		sales += price;
	}

//Function for displaying Sales
	public void DisplaySales()
	{
		System.out.println("The sales of Books currently are: " + sales);
	}
}

//Making Child class Tape of parent class Publication which is also implementing interface Sales
class Tape extends Publication implements Sales
{
    double time;
    static double sales;


//Constructor of Tape with parameters
	public Tape(String title, double price, double time)
	{
		super(title,price);
		this.time= time;
	}


//Display function
	public void display()
	{
		super.display();
		System.out.println("Playing time is " + time + " hrs");
	}


//Function for Sales
	public void InputSales()
	{
		sales += price;
	}

//Function for displaying Sales
	public void DisplaySales()
	{
		System.out.println("The sales of Tapes currently are: " + sales);
	}
}

//Made an Interface
interface Sales
{
	public void InputSales();
	public void DisplaySales();
}

public class BookShop
{
	public static void main(String args[])
	{
		Book book1 = new Book("It's not your Story",150,220);
		Book book2 = new Book("The Fault in our Stars",300,450);
		Tape tape1 = new Tape("The Story of my life",500,4);
		Tape tape2 = new Tape("It's You",280,3.5);
//Made Objects and called functions from them
		book1.InputSales();
		book1.DisplaySales();
		book2.InputSales();
		book2.DisplaySales();
		tape1.InputSales();
		tape1.DisplaySales();
		tape2.InputSales();
		tape2.DisplaySales();
	}
}