simbusstop2.java

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/**
 * Title:        SimBusStop2.java
 * Description:  A simple Bus Stop simulation using Queue
 * 				 Events are generated randomly
 */

import miscLib.SimpleInput;
import miscLib.GenLib;

public class SimBusStop2 {

    public static void main(String[] args) {
    ListQueue t = new ListQueue();
//	ArrayQueue t = new ArrayQueue(50);
    int code, time, count;
    Integer item;

    int totalPeople = 0;
    int totalBus = 0;
    int totalVacantSeat = 0;
    int outstandingWait = 0;

    int people = 0;
    int wait = 0;

	int period;			// the time period in minutes for simulation
	int eventInterval;	// interval of event arrival
	int peopleLB;		// people count - lower bound
	int peopleUB;		// people count - upper bound
	int busLB;			// bus capacity - lower bound
	int busUB;			// bus capacity - upper bound


		period = SimpleInput.getInteger("Enter total duration in minutes: ");
		eventInterval = SimpleInput.getInteger("Enter event interval in minutes: ");
		peopleLB = SimpleInput.getInteger("Enter people count (lower bound): ");
		peopleUB = SimpleInput.getInteger("Enter people count (upper bound): ");
		busLB = SimpleInput.getInteger("Enter bus available seats (lower bound): ");
		busUB = SimpleInput.getInteger("Enter bus available seats (upper bound): ");

		// determine for an event every eventInterval
		count = 0;
		for (int lastTime = 0; lastTime <= period; ) {

			code = GenLib.genInt(-1, 1);	// 0:people, 1:bus, -1:no event

			time = GenLib.genInt(lastTime + 1, lastTime + eventInterval);	// event time
			if (time > period) break;		// stop the loop if time expired
			lastTime = time;				// update the time for next event

			if (code != -1) {
				// it's an event, let's generate the count of the triplet
				if (code == 0) {
					count = GenLib.genInt(peopleLB, peopleUB);	// how many people arrived
					System.out.println(count + " people arrived at time " + time);
				}
				else {
					count = GenLib.genInt(busLB, busUB);		// how many seats available
					System.out.println("Bus with " + count + " seats arrived at time " + time);
				}
			}

			if (code == 0) {	// people arrived and line up in the queue
				totalPeople += count;
				while (count-- > 0)
					t.enqueue (new Integer(time));
			}
			else if (code == 1) {	// bus arrived and people got on bus from the queue
				totalBus++;
				while ( (count > 0) && !t.empty ()) {
					item = (Integer) t.dequeue ();
					wait += time - item.intValue();	// now, we know how long been waiting
					people++;
					count--;
				}
				totalVacantSeat += count;
			}
		}

		// check # of people got on a bus
		if (people != 0) {	// some people got on the bus
			System.out.println (people + " people waited for " +
								wait + " minutes, average waiting time = " +
								(float) wait/people + " minutes.");
		}
		else {	// no one got on the bus
			System.out.println ("0 people go on the bus.");
		}

		// check # o buses passed the bus stop
		if (totalBus != 0) {	// some buses did pass the bus stop
			System.out.println ("Number of buses passed the bus stop = " + totalBus);
			System.out.println ("Average number of people got on a bus = " +
								(float) people/totalBus);
			System.out.println ("Average number of vacant seats for a bus = " +
								(float) totalVacantSeat / totalBus );
		}
		else {	// no bus passed the bus stop
			System.out.println("0 bus passed the bus stop.");
		}

		// check # of people still waiting at the bus stop
		System.out.print ("Number of people still waiting = " +
											(totalPeople - people)  );
		if (!t.empty()) {
			while (!t.empty ()) {
				item = (Integer) t.dequeue ();
				outstandingWait += period - item.intValue();
			}
			System.out.println(" with average waiting time = " +
								(float) outstandingWait / (totalPeople - people) + " minutes");
		}
		else {
			System.out.println(" with average waiting time = 0.0 minute");
		}

		System.exit(0);

	} // main

} // class SimBusStop2