public class Teller				// a teller in the bank simulation
{
	private Customer c;			// teller services one customer at a time, this is the current customer (null if teller is idle)
	
	public Teller()				// constructor just initializes customer to null, no customer currently
	{	
		c=null;
	}
	
	public void newCustomer(Customer c)	// new customer comes up to the teller, teller is now busy
	{
			this.c=c;
	}
	
	public void serviceCustomer()		// in each minute of the simulation, if busy, the teller services the customer
	{									// until the customer is done
		c.isServiced();
		if(c.done()) c=null;
	}
	
	public boolean isBusy()				// is the teller busy?  If c is not null
	{
		return (c!=null);
	}
	
}