Jonathan van Oudheusden

[jonavano]

No description provided.

[ninja-aruna]

This is a good start, but yu are missing a few key top-level classes whcih akes your design incompete. Customer, Manager, and Transaction all need to be modelled as classes, as they have behavior, and properties. this is the way I would do it, but feel free to tweak it

+-------------------------------------------------------+
| <> |
| TransactionType |
+-------------------------------------------------------+
| DEPOSIT |
| WITHDRAWAL |
+-------------------------------------------------------+

+-------------------------------------------------------+
| Transaction |
+-------------------------------------------------------+
| - accountId: String |
| - amount: double |
| - type: TransactionType |
| - timestamp: String |
+-------------------------------------------------------+
| + Transaction(accountId, amount, type, timestamp) |
| + getAccountId(): String |
| + getAmount(): double |
| + getType(): TransactionType |
| + getTimestamp(): String |
+-------------------------------------------------------+

+-------------------------------------------------------+
| OverdraftRequest |
+-------------------------------------------------------+
| - accountId: String |
| - requestedAmount: double |
| - approved: boolean |
| - processed: boolean |
+-------------------------------------------------------+
| + OverdraftRequest(accountId, requestedAmount) |
| + getAccountId(): String |
| + getRequestedAmount(): double |
| + isApproved(): boolean |
| + approve(): void |
| + reject(): void |
| + isProcessed(): boolean |
| + setProcessed(processed: boolean): void |
+-------------------------------------------------------+

+-------------------------------------------------------+
| Account |
+-------------------------------------------------------+
| - accountId: String |
| - customerId: String |
| - branchId: String |
| - transactions: List |
| - overdraftRequests: List |
+-------------------------------------------------------+
| + Account(accountId, customerId, branchId) |
| + getBalance(): double |
| + addTransaction(transaction: Transaction): void |
| + requestOverdraft(amount: double): OverdraftRequest |
| + getPendingOverdraftRequests(): List|
| + getAccountId(): String |
| + getCustomerId(): String |
| + getBranchId(): String |
| + getTransactions(): List |
+-------------------------------------------------------+

+-------------------------------------------------------+
| Branch |
+-------------------------------------------------------+
| - branchId: String |
| - name: String |
| - accounts: List |
+-------------------------------------------------------+
| + Branch(branchId, name) |
| + openAccount(customerId: String): Account |
| + getBranchId(): String |
| + getName(): String |
| + getAccounts(): List |
+-------------------------------------------------------+

+-------------------------------------------------------+
| Customer |
+-------------------------------------------------------+
| - customerId: String |
| - name: String |
| - phoneNumber: String |
| - accounts: List |
+-------------------------------------------------------+
| + Customer(customerId, name, phoneNumber) |
| + addAccount(account: Account): void |
| + sendStatement(message: String): void |
| + getCustomerId(): String |
| + getName(): String |
| + getPhoneNumber(): String |
| + getAccounts(): List |
+-------------------------------------------------------+

+-------------------------------------------------------+
| BankingService |
+-------------------------------------------------------+
| - branches: List |
| - customers: List |
+-------------------------------------------------------+
| + createBranch(name: String): Branch |
| + registerCustomer(name, phoneNumber): Customer |
| + openAccount(customer, branch): Account |
| + deposit(account, amount): void |
| + withdraw(account, amount): boolean |
| + requestOverdraft(account, amount): OverdraftRequest |
| + processOverdraftRequest(account, request, approve):void|
| + getBranches(): List |
| + getCustomers(): List |
| - sendStatement(account, message): void |
+-------------------------------------------------------+

Relationships:
Account "1" → "*" Transaction (Account has many Transactions)

Account "1" → "*" OverdraftRequest (Account has many OverdraftRequests)

Branch "1" → "*" Account (Branch has many Accounts)

Customer "1" → "*" Account (Customer has many Accounts)

BankingService "1" → "*" Branch (Manages many Branches)

BankingService "1" → "*" Customer (Manages many Customers)

BankingService depends on Account, Transaction, and OverdraftRequest for operations

Key Design Points:
State calculated from history: The Account class doesn't store balance as a field but calculates it from transactions

Branch association: Each account links to a branch via branchId

Overdraft workflow: Clear separation between request, approval, and processing

Messaging: Customer has phone number and receives statements via sendStatement()

Service layer: BankingService orchestrates all operations