ZCW-YeOldeCode/DepositAccount.java

class DepositAccount extends Account
{
    private boolean newmonth=true;
    private double interest;

    public DepositAccount(int sum,double interest)
    {
        super(sum);
        this.interest=interest;
    }

    // 
    public void withdraw(int sum) throws AccountException
    {
        if(sum<=super.balance())
            super.withdraw(sum);
        else
            throw new AccountException("overdraw");
    }

    public void update()
    {
        deposit((int)(balance()*interest));
        newmonth=true;
    }

    public void setInterest(double newInterest)
    {
        interest=newInterest;
    }
}