Java Assignment I need help with design. This material is somewhat more theoreti

Question

Java Assignment

I need help with design.

This material is somewhat more theoretical than that of previous topics, so instead of writing a program for this assignment, you are going to work on a design. Specifically, your task is to design a class to represent a credit card. Try to design your class such that it only includes fields and methods relative to a credit card itself, without branching out into related functionality, like that of a bank or a consumer. At the same time, try to make your class as complete as possible, so that it can be used in any application that involves a credit card. To complete this assignment, you will turn in a text document (Word or PDF) with the following information: • A list of the fields and methods of your class. For fields you will need to specify the type, the accessibility (private, public, etc), whether it is a static or instance field, and any limitations on the values (non-negative, always less than some other value, etc). For the methods, you will need to supply the return type and parameter type list. • A free-form description of what each field and method is meant to do, with explanation of any potentially confusing design decisions.

This is what I have so far. No code is needed for this.

Public class CreditCard
   Members:
       Private String name
       Private String password
       Private Date date_of_issue
       Private Date date_of_expiry
       Private Double balance
       Private static final Double creditLimit = 5000; // for 5000Dollars
       Private Double TransactionLimit;
       private Boolean isActive;
      
   constructor
       CreditCard(Name, Password, balance, TransactionLimit)
           //set card to active, set the name, password, balance and transactionLimit
           //set date_of_issue to today and date_of_expiry to 10 years later
          
      
   Methods
       public debit(password, amount)
           //Debit the amount, if password matches and balance is greater than the amount to be //withdrawn
       public credit(amount)
           //Credit the amount, sum the amount to balance

public getNameOnCard()
           //return name of the card holder
       public isCardWorking()
           //return if date_of_expiry is after today's date and if card is in active state
       public getBalance()
           //return the balance
       public getCreditLimit()
           //return the creditLimit
       public getTransactionLimit()
           //return the transactionLimit
       public isActive()
           //return true is card is active
          
      
       public setName(name)
           //set card holder name
       public setPassword(pass)
           //set password for the card

Explanation / Answer

I think debit happens on the account linked to the credit card and not the card itself. So instead of having methods for crediting and debiting money , we need to have the account number of the account linked to the card. And debit and credit methods need to go in Account Class(which is none of our concern right now)

therefore we should'nt have methods like debit credit and balance as these are supposed to be methods of the Account class.

We need one private instance variable namely , the linked account number.

private final long linkedAccNo ; // and corresponding getters and setters

final because once a card is linked to an acc , it can never be shifted to another account. It can only be cancelled.

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