Programming Example
Define a class named BookFair with the following description:
Study this program carefully to understand the logic, output, and explanation in a structured way.
Define a class named BookFair with the following description:
Instance variables/Data members:
String Bname — stores the name of the book
double price — stores the price of the book
Member methods:
(i) BookFair() — Default constructor to initialize data members
(ii) void Input() — To input and store the name and the price of the book.
(iii) void calculate() — To calculate the price after discount. Discount is calculated based on the following criteria.
| Price | Discount |
|---|---|
| Less than or equal to ₹1000 | 2% of price |
| More than ₹1000 and less than or equal to ₹3000 | 10% of price |
| More than ₹3000 | 15% of price |
(iv) void display() — To display the name and price of the book after discount.
Write a main method to create an object of the class and call the above member methods.
import java.util.Scanner;
public class BookFair
{
private String bname;
private double price;
public BookFair() {
bname = "";
price = 0.0;
}
public void input() {
Scanner in = new Scanner(System.in);
System.out.print("Enter name of the book: ");
bname = in.nextLine();
System.out.print("Enter price of the book: ");
price = in.nextDouble();
}
public void calculate() {
double disc;
if (price <= 1000)
disc = price * 0.02;
else if (price <= 3000)
disc = price * 0.1;
else
disc = price * 0.15;
price -= disc;
}
public void display() {
System.out.println("Book Name: " + bname);
System.out.println("Price after discount: " + price);
}
public static void main(String args[]) {
BookFair obj = new BookFair();
obj.input();
obj.calculate();
obj.display();
}
}Enter name of the book: Java the ultimate
Enter price of the book: 2081
Book Name: Java the ultimate
Price after discount: 1872.9
Press any key to continue . . .
First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.
After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.