Programming Example

Design a class name ShowRoom with the following description:

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💻 Practical Program

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Study this program carefully to understand the logic, output, and explanation in a structured way.

Information & Algorithm

Design a class name ShowRoom with the following description:

Instance variables / Data members:
String name — To store the name of the customer
long mobno — To store the mobile number of the customer
double cost — To store the cost of the items purchased
double dis — To store the discount amount
double amount — To store the amount to be paid after discount

Member methods:
ShowRoom() — default constructor to initialize data members
void input() — To input customer name, mobile number, cost
void calculate() — To calculate discount on the cost of purchased items, based on following criteria

Cost	Discount (in percentage)
Less than or equal to ₹10000	5%
More than ₹10000 and less than or equal to ₹20000	10%
More than ₹20000 and less than or equal to ₹35000	15%
More than ₹35000	20%

void display() — To display customer name, mobile number, amount to be paid after discount.

Write a main method to create an object of the class and call the above member methods.

Program Code

import java.util.Scanner;

public class ShowRoom
{
    private String name;
    private long mobno;
    private double cost;
    private double dis;
    private double amount;

    public ShowRoom()
    {
        name = "";
        mobno = 0;
        cost = 0.0;
        dis = 0.0;
        amount = 0.0;
    }

    public void input() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter customer name: ");
        name = in.nextLine();
        System.out.print("Enter customer mobile no: ");
        mobno = in.nextLong();
        System.out.print("Enter cost: ");
        cost = in.nextDouble();
    }

    public void calculate() {
        int disPercent = 0;
        if (cost <= 10000)
            disPercent = 5;
        else if (cost <= 20000)
            disPercent = 10;
        else if (cost <= 35000)
            disPercent = 15;
        else
            disPercent = 20;

        dis = cost * disPercent / 100.0;
        amount = cost - dis;
    }

    public void display() {
        System.out.println("Customer Name: " + name);
        System.out.println("Mobile Number: " + mobno);
        System.out.println("Amout after discount: " + amount);
    }

    public static void main(String args[]) {
        ShowRoom obj = new ShowRoom();
        obj.input();
        obj.calculate();
        obj.display();
    }
}

Output

Enter customer name: Rumman Ansari
Enter customer mobile no: 8765465655
Enter cost: 26000
Customer Name: Rumman Ansari
Mobile Number: 8765465655
Amout after discount: 22100.0
Press any key to continue . . .

How to learn from this program

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.

Practice suggestion

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.