Thread: Queue Simulation

Norm can you check this ive got two System.currentTimeMillis() for the arrival_time and exit_time but how do state that the arrival_time corresponds to the add customer System.currentTimeMillis() and the wait_time corresponds to the remove customer System.currentTimeMillis() ?

public class Customer
	{
		int id;
		long arrival_time = System.currentTimeMillis();
		long exit_time = System.currentTimeMillis();
		String cashier;
		long wait_time = exit_time - arrival_time;
 
		public String toString() 
		{
			return "Customer id="+id + " arvTm="+arrival_time;
	    }
	}

                             try 
				{
					Thread.sleep(wait * 1);
					line.add(new Station());
					System.currentTimeMillis();
					System.out.println(line);
				}

for (int i = 0; i < max_customers; i++)
		if (cashiers != null)
		{
			cashiers[0] = line.poll();
			System.currentTimeMillis();
			System.out.println(line);
		}

The *1 I can change later i just put that there to test everything quickly. So your saying that I should remove the System.currentTimeMillis() ? And yes or are right about no wait_time exist for the first customer however I still need to output the wait_time even for the first customer which would be 0.

So I known how to call the System.currentTimeMillis(); but how do I save the value and return it to the arrival_time and exit_time ? And Ive tested what would be outputted from the toString() and its this

Customer id=0 arvTm=1365195765216

how come the customer ID is 0 and the are not numbered and the arvTm is coming up with random numbers.