Project4 Computational Problem Solving 

Project4 CSC220 Computational Problem Solving 
Project Details
In this project, you will write a program that allows a user to repeatedly create and manage express
card accounts.
Each express card is like a debit card, except that it can only be used to purchase meals. A new
express card account starts at a balance of $0. The user can
1. deposit money to the express card, increasing the balance (by depositing more money),
2. purchase meals at a fixed rate, thus decreasing the balance, and
3. have meals ( each swipe of the card reduces the remaining number of meals by one).
In this project, we will only implement one type of express accounts: student express accounts. A student express account have fields accountNumber , accountBalance , numberOfMeals , pricePerMeal ,
baseAmtForBonus , rewardLevel and rewardAmt .
• The field baseAmtForBonus is used to record the bonus cashback for an account when making a
deposit.
• There is a base amount one-time deposit ( baseAmtForBonus ) to receive bonus which is the
minimum amount of money for each deposit. For this project, it is set to $500.0. For example, if
the baseAmtForBonus is $500 and deposit $499 will not receive any bonus.
• For every deposit that is greater than the baseAmtForBonus , for each rewardLevel , a student
account receives rewardAmt amount of money. For example, if rewardLevel is set to 200.0 and
rewardAmt is set to 2.0, then a deposit of $500 to a $0 balance student express account will result
$4.0 bonus and a new balance of $504.0. However, a deposit of $499 to a $100 balance student
express account will not obtain any bonus and final balance is $599.0.
The variable rewardLevel should be set to $200.0 and rewardAmt to $2.0. While we won’t
change the value of them in this project, they must be variables.
• The pricePerMeal is $10.0.
Implementation Hints
• Start by writing the ExpressAccount class with only the accountBalance field, a toString()
method that outputs the balance, and a main() method that instantiates a new instance of the
ExpressAccount class and outputs the result of calling the toString() method. Compile and
test to make sure that this simple version works.
• Gradually build up the functionality of the ExpressAccount class, adding each field and method
in turn, testing thoroughly that your class works at each step. Do this very gradually, breaking
the development of the ExpressAccount class into small steps. It is often a handy trick to write
a main() method for every class that tests the class thoroughly. This is very useful for diagnostic
purposes, and will be essential when we start developing larger programs.
• To accept input from the console, use java.util.Scanner to directly accept input from System.in .
1 March 28, 2016
Project4 CSC220 Computational Problem Solving Spring 2016
• Notice that you have two levels of menu: main menu and sub-menus. The main menu looks as
follows:
MAIN MENU
1.) Create a new account
2.) Log into an existing account
3.) Exit the banking system
The sub-menu looks as follows:
EXPRESS ACCOUNT #0, BALANCE: $0.0, NUMBER OF MEALS: 0
1.) Make a deposit
2.) Purchase meals
3.) Have meal
4.) Log out
For each option in the main menu, there is a sub-menu for this option. However, some sub-menus
share the same functionalities. For example, after you create an account, the display is the same
as after you choose to log into an existing account. Instead of writing same code several times,
you should try to make your program as modularly as possible by writing small methods. One
good practice would be separating the display the menu from the logic of making options on the
menu by passing parameters and getting return values wisely. With this in mind, you will notice
that we have the following functionalities in the menu part:
– display the main menu
– create a new account of type ExpressAccount
– store an account into the list
– retrieve an account information from the list
– display a user menu (for making a deposit, purchasing meals, etc)
For each of these functionalities, it is recommended to have a method implementing it.
• Be sure to do error checking on the inputs. Negative deposit and number of meals to purchase
are not allowed.
• Since we’re working with money, all decimals need to be rounded off to two decimal places.
• After you are done with the implementation, make sure you clean up your code. Remove unnecessary testing code and comments.
• All source files should include a description header, be properly indented and commented.
2 March 28, 2016
Project4 CSC220 Computational Problem Solving Spring 2016
Code Skeleton
Your final java source code should include the following classes:
• ExpAcct.java : This is where your main method will be. It contains the whole logic of the
application. That is, the main menu and the sub-menu are implemented in this class using
methods. Moreover, a list of accounts, implemented in ArrayList, is maintained in this class.
• ExpressAccount.java : This is the class that contains the account properties and behaviors of
the classes.
Part of the code skeleton is shown as follows:
p u bli c c l a s s ExpAcct {
. . . . . .
p u bli c s t a t i c v oid main ( S t ri n g [ ] a r g s ) {
. . . . . .
}
}
p u bli c c l a s s ExpressAccount {
. . . . . .
p u bli c ExpressAccount ( i n t accNumber ) {
. . . . . .
}
p u bli c i n t getAccountNumber ( ) {
. . . . . .
}
p u bli c d ouble ge tAcc oun tB al ance ( ) {
. . . . . .
}
p u bli c d ouble getBaseAmtForBonus ( ) {
. . . . . .
}
p u bli c d ouble ge tP ri cePe rMe al ( ) {
. . . . . .
}
p u bli c i n t getNumOfMeals ( ) {
. . . . . .
}
p u bli c S t ri n g t o S t ri n g ( ) {
. . . . . .
}
. . . . . .
}
Example running trace:
Your program must have the same interface as shown below.
3 March 28, 2016
Project4 CSC220 Computational Problem Solving Spring 2016
Welcome to the Express Account Company
MAIN MENU
1.) Create a new account
2.) Log into an existing account
3.) Exit the banking system
Please enter your selection: 1
EXPRESS ACCOUNT #0, BALANCE: $0.0, NUMBER OF MEALS: 0
1.) Make a deposit
2.) Purchase meals
3.) Have meal
4.) Log out
Please enter your selection: 1
Enter deposit amount: 600
Deposit $600.0 New balance $606.0
EXPRESS ACCOUNT #0, BALANCE: $606.0, NUMBER OF MEALS: 0
1.) Make a deposit
2.) Purchase meals
3.) Have meal
4.) Log out
Please enter your selection: 2
Enter the number of meals you want to purchase: 1
Purchased 1 meals with $10.0 per meal New balance $596.0
EXPRESS ACCOUNT #0, BALANCE: $596.0, NUMBER OF MEALS: 1
1.) Make a deposit
2.) Purchase meals
3.) Have meal
4.) Log out
Please enter your selection: 3
EXPRESS ACCOUNT #0, BALANCE: $596.0, NUMBER OF MEALS: 0
1.) Make a deposit
2.) Purchase meals
3.) Have meal
4.) Log out
Please enter your selection: 3
No meals left on your account. Please purchase meals first.
EXPRESS ACCOUNT #0, BALANCE: $596.0, NUMBER OF MEALS: 0
1.) Make a deposit
2.) Purchase meals
3.) Have meal
4.) Log out
4 March 28, 2016
Project4 CSC220 Computational Problem Solving Spring 2016
Please enter your selection: 1
Enter deposit amount: 0
The deposit must be a positive amount.
EXPRESS ACCOUNT #0, BALANCE: $596.0, NUMBER OF MEALS: 0
1.) Make a deposit
2.) Purchase meals
3.) Have meal
4.) Log out
Please enter your selection: 2
Enter the number of meals you want to purchase: 60
Not enough balance for 60 meals
Purchased 59 meals, New balance $6.0
EXPRESS ACCOUNT #0, BALANCE: $6.0, NUMBER OF MEALS: 59
1.) Make a deposit
2.) Purchase meals
3.) Have meal
4.) Log out
Please enter your selection: 4
Goodbye!
MAIN MENU
1.) Create a new account
2.) Log into an existing account
3.) Exit the system
Please enter your selection: 2
Enter account number: 0
Welcome back Student Express account #0, balance: $6.0, number of meals: 59
EXPRESS ACCOUNT #0, BALANCE: $6.0, NUMBER OF MEALS: 59
1.) Make a deposit
2.) Purchase meals
3.) Have meal
4.) Log out
Please enter your selection: 4
Goodbye!
MAIN MENU
1.) Create a new account
2.) Log into an existing account
3.) Exit the system
Please enter your selection: 3
Exiting the system
5 March 28, 2016
Project4 CSC220 Computational Problem Solving Spring 2016
What to turn in:
JAR your *.java files into a file called Project4.jar. Upload the jar file to Canvas under category
Project4.
6 March 28, 2016