Class BankAccount

java.lang.Object

BankAccount

public class BankAccount
extends java.lang.Object

This class models a bank account. It holds the name of the owner, the current balance and a list of transactions that were performed on this bank account.

Author:

123456ab Paul Bouman

Constructor Summary

Constructors

Constructor and Description
BankAccount(java.lang.String ownerName, int initialBalance) This constructor stores the name of the owner and the initial balance of the bank account.

Method Summary

Modifier and Type	Method and Description
double	computeBalanceAfterInterest(int periods, double rate) Computes the balance after applying a given interest rate for a number of periods.
int	getBalance() Provides the current balance of this bank account.
java.lang.String	getOwner() Provides the owner associated with this bank account, that was provided during the creation of this bank account object.
java.util.List<Transaction>	getTransactions() Provides the list of transactions that involve this bank account.
void	withdrawMoney(int amount) Performs the withdraw money transaction on this bank account.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BankAccount

public BankAccount(java.lang.String ownerName,
                   int initialBalance)

This constructor stores the name of the owner and the initial balance of the bank account. By default, the list of transactions associated with the bank account is empty.

Parameters:

ownerName - the name of the owner of the new bank account

initialBalance - the initial balance of the new bank account

Method Detail

computeBalanceAfterInterest

public double computeBalanceAfterInterest(int periods,
                                          double rate)
                                   throws java.lang.IllegalArgumentException

Computes the balance after applying a given interest rate for a number of periods.

It is assumed that interest is paid at the end of each period, and that the interest is compounded.

The formula used for this is: balance × (1 + rate)^periods

Example: a bank account with a balance of 100 will become 110.25 after applying an interest of 0.05 for two periods.

Parameters:

periods - the number of periods in which interest should be applied

rate - the interest rate applied in every period

Returns:

the balanced after the interest is applied for the number of periods to the current balance

Throws:

java.lang.IllegalArgumentException - if periods is smaller than zero

getBalance

public int getBalance()

Provides the current balance of this bank account. The current balance is the initial balance provided when the object was created adjusted by succesful transactions involving this bank account.

Returns:

the current balance of the bank account

getOwner

public java.lang.String getOwner()

Provides the owner associated with this bank account, that was provided during the creation of this bank account object.

Returns:

the name of the owner of this bank account

getTransactions

public java.util.List<Transaction> getTransactions()

Provides the list of transactions that involve this bank account. Note that this list cannot be modified.

Returns:

an unmodifiable list of transactions involving this bank account.

withdrawMoney

public void withdrawMoney(int amount)
                   throws java.lang.IllegalArgumentException

Performs the withdraw money transaction on this bank account. The transaction is only performed if there is sufficient balance on the account.

Parameters:

amount - the amount of money to withdraw from the bank account

Throws:

java.lang.IllegalArgumentException - if the amount exceeds the current balance of the account