Question

Java Programming

Problem description with its major requirements labeled from A to I.

A mobile phone service provider has three different subscription packages for its customers: Package A: For $39.99 per month 450 minutes are provided. Additional minutes are $0.45 per minute. Package B: For $59.99 per month 900 minutes are provided. Additional minutes are $0.40 per minute. Package C: For $69.99 per month unlimited minutes are provided.

Design a class MobileCharges that calculates a customer’s monthly bill. It should store the letter of the package the customer has purchased (A, B, or C) (A) and the number of minutes that were used (B). It should have a method getTotalCharges(). that returns the total charges (C).

Your program should use a non-default constructor as the following (D) public MobileCharges(char packageChoice, double minutes)

The program should calculate the total changes in the constructor’s body (E).

Your program should get the total charges using a method getTotalCharges()

Your program should accept both capital or small letter for each choice (F).

Your program should check for incorrect option character and show error message (G)

The program should display the total charges with two digits after decimal point (H).

Demonstrate the class in a program that asks the user to select a package and enter the number of minutes used (I).

Answer 1

Code:

import java.util.*;
import java.io.*;

public class MobileCharges
{
    private double totalCharges;
    public MobileCharges(char packagechoice,double minutes)//constructor
    {
        if(packagechoice=='a'||packagechoice=='A')//accepts both small and capital letters
        {
            if(minutes<=450)
                totalCharges = 39.99;
            else
                totalCharges = 39.99 + (minutes-450)*0.45;
        }
        else if(packagechoice=='b'||packagechoice=='B')
        {
            if(minutes<=900)
                totalCharges = 59.99;
            else
                totalCharges = 59.99 + (minutes-900)*0.40;
        }
        else if(packagechoice=='c'||packagechoice=='C')
                totalCharges = 69.99;

    }

    public double getTotalCharges()
    {
        return totalCharges;
    }

    public static void main(String args[]) throws Exception
    {
            char a;
            double min,finalcharges;
            Scanner in=new Scanner(System.in);
            
            //taking input from user
            System.out.print("Enter the package you have opted for: ");
            a=in.next().charAt(0);
            while(a!='A'&&a!='a'&&a!='B'&&a!='b'&&a!='C'&&a!='c')//for invalid input
            {
                System.out.print("Invalid input, enter again: ");
                a=in.next().charAt(0);
            }
            System.out.print("Enter the total number of minutes: ");
            min=in.nextDouble();

            MobileCharges obj=new MobileCharges(a,min);
            finalcharges=obj.getTotalCharges();
            System.out.printf("The total charges for pacakge "+a+" for "+min+" minutes "+ " is %.2f",finalcharges);
    }
}

Output: