BankManager

Java OOP bank simulation: customers, savings/checking accounts, deposits, withdrawals, transfers and a simple portfolio view. Originally a coursework UML project; this revision opens the source in a Maven layout, fixes account ownership, and routes money movement through BankManager.

Features

• Individual and institutional customers
• Savings and checking accounts with interest helpers
• Account lifecycle via AccountManagement
• Deposits, withdrawals and transfers via TransactionExecution
• Per-customer financial portfolio totals

Domain model

classDiagram
direction TB
class AccountManagement {
<<interface>>
+createAccount()
+deleteAccount()
+displayAccountDetails()
+updateContactDetails()
}
class TransactionExecution {
<<interface>>
+deposit()
+withdraw()
+transfer()
}
class BankManager {
-accounts: List~Account~
}
class Customer {
<<abstract>>
#name: String
#address: String
#contactDetails: String
+addAccount()
+removeAccount()
}
class IndividualCustomer
class InstitutionalCustomer
class Account {
<<abstract>>
#accountNumber: String
#balance: double
+applyInterest()
+calculateFutureBalance()
}
class SavingsAccount
class CheckingAccount
class FinancialPortfolio {
+calculateTotalValue()
+comparePortfolio()
}
class Transaction {
-type: String
-amount: double
}
AccountManagement <|.. BankManager
TransactionExecution <|.. BankManager
Customer <|-- IndividualCustomer
Customer <|-- InstitutionalCustomer
Account <|-- SavingsAccount
Account <|-- CheckingAccount
BankManager o-- Account
Customer o-- Account
Customer *-- FinancialPortfolio
FinancialPortfolio o-- Account
Account o-- Transaction

Loading

Course UML diagram (Visual Paradigm):

Quick start

./mvnw test
./mvnw -q exec:java

On Windows:

mvnw.cmd test
mvnw.cmd -q exec:java

Notes

• Interest rates are annual percentages (for example 1.5 means 1.5%).
• Transfers fail when the source account has insufficient funds; balances stay unchanged.
• Account numbers must be unique inside one BankManager instance.

License

MIT

Maintenance

Small doc touch-ups land through pull requests.