Transaction

public abstract class Transaction
{
    private int accountNumber;
    private TollDatabase tollDatabase;
    public Transaction(int userAccountNumber,TollDatabase gateTollDatabase)
    {
        accountNumber = userAccountNumber;
    }

    public int getAccountNumber()
    {
        return accountNumber;
    }

    public TollDatabase getTollDatabase()
    {
        return tollDatabase;
    }

    abstract public void execute();
}