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Thread: Banking System UML Class Diagram in to code.

  1. #1
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    Default Banking System UML Class Diagram in to code.

    Hi again,

    today we got given this problem:

    The LandL bank can handle at least 30 customers who have savings accounts.

    * Design and then implement a program which manages deposits and withdrawls.
    * Produce suitable error messages for invalid transactions
    * Add a method which adds 3% to all accounts when it is invoked.


    In class today we designed a class diagram in a group and this is our result: (tutor said tis fine and now we need to code it):

    Bank Class
    -customers: ArrayList<Customer>
    +getCustomerById(int): Customer

    Customer Class
    -customerId: int
    -name: String
    -accounts: ArrayList<Account>
    +getCustomerId()
    +getName()
    +getAccount(int)

    Account Class
    -accountId: int
    -balance: double
    +getId(): int
    +getbalance(): double
    +deposit(double)
    +withdraw(double)
    +rasieByPercentage(double)


    I am using netbeans to code this in java

    I have a few questions please that would help me get started.

    How many Main classes and normal classes do i need?
    What should the programs actually do?
    do i create 30 names for customers in an Array?
    do i ask for user input by typing in a name and then ask what they want to do i.e. make a deposit, make a withdrawal and request balance
    What do they mean by: Add a method which adds 3% to all accounts when it is invoked.


    Many thanks for your help


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    Default Re: Banking System UML Class Diagram in to code.

    According to your specifications, there are no "main classes" (I'm assuming this refers to classes with the static entry-point main method). However, I would create a separate class (i.e. not one listed above) that you does have a main method and allows you to test your other classes with.

    The specifications seem to denote that your program should act like a library that can be used by some front end (either a command-line app, gui app, or even web-based app). It's also possible that the front end has no user interface at all, for example a test class which runs the library with different parameters and test situations to make sure it works.

    You're already using an ArrayList in your bank class, why would you need a second array?

    Ideally your program should not ask for any user input, it should receive method parameters and operate on those. If you wanted to you can create a separate front end which you can play around your library with.

    It sounds like you're suppose to increase the amount of money in each account by 3% of its previous value.

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    Default Re: Banking System UML Class Diagram in to code.

    Do i create an ArrayList and just do a list of 30 customer IDs?

    And this is in the customer class?

    In the account class i assign a balance (double) to each customer ID?


    Is that right?

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