Design a class that calculates a customer's monthly bill. It should

store the letter of the package the customer has purchased $($A$,$ B$,$ or

C$)$ and the number of minutes that were used. It should have a method

that returns the total charges. Demonstrate the class in a program

that asks the user to select a package and enter the number of minutes

used. The program should display the total charges

MobileCharges

PACKAGE$\_$IDENTIFIER$\_$A: char $=\text{'}$A$\text{'}$

PACKAGE$\_$IDENTIFIER$\_$B: char $=\text{'}$B$\text{'}$

PACKAGE$\_$IDENTIFIER$\_$C: char $=\text{'}$C$\text{'}$

PURCHASE$\_$PRICE$\_$A : double $=39\mathrm{.}99$

PURCHASE$\_$PRICE$\_$B : double $=59\mathrm{.}99$

PURCHASE$\_$PRICE$\_$C : double $=69\mathrm{.}99$

MINUTES$\_$PROVIDED$\_$A : double $=450\mathrm{.}0$

MINUTES$\_$PROVIDED$\_$B : double $=900\mathrm{.}0$

MINUTES$\_$PROVIDED$\_$C : double $=44640\mathrm{.}0$

PRICE$\_$PER$\_$MINUTE$\_$A : double $=0\mathrm{.}45$

PRICE$\_$PER$\_$MINUTE$\_$B ; double $=0\mathrm{.}40$

PRICE$\_$PER$\_$MINUTE$\_$C : double $=0\mathrm{.}00$

packageldentifier : char

minutesUsed ; double

minutesProvided : double

pricePerMinute : double

purchasePrice : double

additionalMinutes : double

additionalCharges ; double

totalCharges : double

MobileCharges$(p$; char, $m$; double$)$

setPackageldentifier$($p : char$)$ : void

setMinutesUsed$($m : double$)$ : void

getPackageldentifier$()$ : char

getMinutesUsed $0$ : double

getMinutesProvided $()$; double

getPricePerMinute $()$: double

getPurchasePrice $0$ : double

getAdditionalMinutes$()$ : double

getAdditionalCharges$0$: double

getTotalCharges $0$ : double

template for Mobile charges

$//$Template for MobileCharges

public class MobileCharges

$\{$

$//$ Named constants

private final char PACKAGE$\_$IDENTIFIER$\_$A $=\text{'}$A$\text{'}$;

private final char PACKAGE$\_$IDENTIFIER$\_$B $=\text{'}$B$\text{'}$;

private final char PACKAGE$\_$IDENTIFIER$\_$C $=\text{'}$C$\text{'}$;

private final double PURCHASE$\_$PRICE$\_$A $=39\mathrm{.}99$;

private final double PURCHASE$\_$PRICE$\_$B $=59\mathrm{.}99$;

private final double PURCHASE$\_$PRICE$\_$C $=69\mathrm{.}99$;

private final double MINUTES$\_$PROVIDED$\_$A $=450\mathrm{.}0$;

private final double MINUTES$\_$PROVIDED$\_$B $=900\mathrm{.}0$;

private final double MINUTES$\_$PROVIDED$\_$C $=44640\mathrm{.}0$;

private final double PRICE$\_$PER$\_$MINUTE$\_$A $=0\mathrm{.}45$;

private final double PRICE$\_$PER$\_$MINUTE$\_$B $=0\mathrm{.}40$;

private final double PRICE$\_$PER$\_$MINUTE$\_$C $=0\mathrm{.}00$;

$//$ Fields

private char packageIdentifier;

private double minutesUsed;

private double minutesProvided;

private double pricePerMinute;

private double purchasePrice;

private double additionalMinutes;

private double additionalCharges;

private double totalCharges;

public MobileCharges$($char p$,$ double m$)$

$\{$

$//$ Set the package identifier.

packageIdentifier $=$ Character.toUpperCase$($p$)$;

$//$ Set the number of minutes used.

minutesUsed $=$ m;

$//$ Detetermine the selected package.

switch$($packageIdentifier$)$

$\{$

$//$ Add your code

$//$ Add your code

$//$ Add your code

$//$ Add your code

$//$ Add your code

$//$ Add your code

$//$ Add your code

$\}$

$//$ Determine if the minutes used exceeds the minutes provided.

if $($minutesUsed $>$ minutesProvided$)$

$\{$

$//$ Add your code

$//$ Add your code

$\}$

else

$\{$

$//$ Add your code

$//$ Add your code

$\}$

$//$ Calculate and set the total charges.

$//$ Add your code

$\}$

public void setPackageIdentifier$($char p$)$

$\{$

packageIdentifier $=$ Character.toUpperCase$($p$)$;

$\}$

public void setMinutesUsed$($double m$)$

$\{$

minutesUsed $=$ m;

$\}$

public char getPackageIdentifier$()$

$\{$

return packageIdentifier;

$\}$

public double getMinutesUsed$()$

$\{$

return minutesUsed;

$\}$

public double getMinutesProvided$()$

$\{$

$//$ Return the minutes provided.

return minutesProvided;

$\}$

public double getPricePerMinute$()$

$\{$

$//$ Return the price per minute.

return pricePerMinute;

$\}$

public double getPurchasePrice$()$

$\{$

$//$ Return the purchase price.

return purchasePrice;

$\}$

public double getAdditionalMinutes$()$

$\{$

$//$ Return the number of additional minutes used.

return additionalMinutes;

$\}$

public double getAdditionalCharges$()$

$\{$

$//$ Return the additional charges.

return additionalCharges;

$\}$

public double getTotalCharges$()$

$\{$

$//$ Return the total monthly charges.

return totalCharges;

$\}$

$\}$