Simple POJO with Control of Security

public class BankAccount {

public void transfer(BigDecimal amount, BankAccount recipient) {

SecurityManager.hasPermission(this, Permission.TRANSFER,

SecurityContext.getCurrentUser());

recipient.deposit(this.withdraw(amount));

}

public void closeOut() {

SecurityManager.hasPermission(this, Permission.CLOSE_OUT,

SecurityContext.getCurrentUser());

this.open = false;

}

public void changeRates(BigDecimal newRate) {

SecurityManager.hasPermission(this, Permission.CHANGE_RATES,

SecurityContext.getCurrentUser());

this.rate = newRate;

}

}