Basic Java Bank Teller Help [Huge Post]

[bugg123]

Basically this is a pretty simple program that is supposed to simulate a bank with customers and a circular queue line. While my program "works" it doesn't process the events correctly, the circular queue has a mind of its own and I think my compareTo in events must be off. Also right now they are supposed to wait in line till a teller is free and there are supposed to be 3 of them, not sure how to begin implementing this. Any help and/or feedback would be appreciated greatly! Sorry for the ridiculous amount of information, just figured I'd hopefully give you guys everything you needed.

import java.io.FileReader;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class Main{
public static void main(String[] args) throws FileNotFoundException{
int time=0;
Scanner in = new Scanner(new FileReader("lab5data.txt"));

Customer a,b,c;
OrderedList events = new OrderedList(500);
Queue line = new Queue(500);
int i=0;
while (in.hasNext()){


i++;
Customer cust = new Customer(i,in.nextInt(),in.nextInt());
Event arrival = new Event('A',time,cust);
time = cust.getArrivalTime();
events.insert(arrival);

while (!events.isEmpty()){
Event current = events.give();


if (current.getEventType() == 'A'){
System.out.println("Customer " + current.getCustomer().getCustomer_ID() + " has arrived at "+ current.getCustomer().getArrivalTime());
boolean atFront = line.isEmpty();
line.enqueue(current.getCustomer());


if (atFront){
Event dep = new Event('D',((current.getCustomer()).getTransactionTime()+ time),current.getCustomer());
events.insert(dep);

}

if (!atFront){
cust = new Customer(i,in.nextInt(),in.nextInt());
arrival = new Event('A',time,cust);
events.insert(arrival);

}
}
else if (current.getEventType() == 'D'){
line.dequeue();
System.out.println("Customer " +current.getCustomer().getCustomer_ID()+ " leaves at " + current.getEventTime());
events.delete(1);
events.delete(1);


if(!line.isEmpty()){
current = events.give();
Event dep = new Event('D',((current.getCustomer()).getTransactionTime()+ time),current.getCustomer());
events.insert(dep);

}
}

}
}
}
}
public class Queue{
private Customer[] elements;
private int currentSize;
private int maxSize;
private int front=0, end=0;


public Queue(int size){
elements = new Customer[size];
maxSize = size;
}
public boolean isEmpty(){
return currentSize == 0;
}

public boolean isFull(){
return currentSize==maxSize;
}

public void enqueue(Customer in){
elements[end] = in;
end++;
if (end == maxSize)
end=0;
}

public Customer dequeue(){
Customer ans = elements[front];
front++;
return ans;
}
}

public class Event{
private char eventType;
private int eventTime;
private Customer theCustomer;

public Event(char type, int time, Customer in){
eventType = type;
eventTime = time;
theCustomer = in;
}

public char getEventType(){
return eventType;
}

public int getEventTime(){
return eventTime;
}

public Customer getCustomer(){
return theCustomer;
}

public int compareTo(Event in){
if (this.getEventTime() > in.getEventTime())
return 1;
else if (this.getEventTime() < in.getEventTime())
return -1;
else
return 0;
}
}
public class Customer{


private int customer_ID, arrivalTime, departureTime, transactionTime;



public Customer(int id, int arrival, int trans){
customer_ID = id;
arrivalTime = arrival;
transactionTime = trans;
departureTime = arrival + trans;

}

public int getArrivalTime(){
return arrivalTime;
}

public int getTransactionTime(){
return transactionTime;
}

public int getCustomer_ID(){
return customer_ID;
}

public int getDepartureTime(){
return departureTime;
}

public void setDepartureTime(int time){
departureTime = time;
}

public int calculateTurnAround(){
return departureTime-arrivalTime;
}


}
With the following output:
Customer 1 has arrived at 1
Customer 1 leaves at 6
Customer 2 has arrived at 2
Customer 2 leaves at 7
Customer 3 has arrived at 3
Customer 3 leaves at 9
Customer 4 has arrived at 4
Customer 4 leaves at 11
Customer 5 has arrived at 5
Customer 5 leaves at 7
Customer 6 has arrived at 6
Customer 6 leaves at 16
Customer 7 has arrived at 7
Customer 7 leaves at 10
Customer 8 has arrived at 8
Customer 8 leaves at 13
Customer 9 has arrived at 9
Customer 9 leaves at 17
Customer 10 has arrived at 10
Customer 10 leaves at 12
Customer 11 has arrived at 11
Customer 11 leaves at 13
Customer 12 has arrived at 12
Customer 12 leaves at 17
Customer 13 has arrived at 13
Customer 13 leaves at 18
Customer 14 has arrived at 14
Customer 14 leaves at 19
Customer 15 has arrived at 15
Customer 15 leaves at 20
Customer 16 has arrived at 16
Customer 16 leaves at 22
Customer 17 has arrived at 17
Customer 17 leaves at 24
Customer 18 has arrived at 18
Customer 18 leaves at 20
Customer 19 has arrived at 25
Customer 19 leaves at 35
Customer 20 has arrived at 31
Customer 20 leaves at 34
Customer 21 has arrived at 36
Customer 21 leaves at 41
Customer 22 has arrived at 37
Customer 22 leaves at 45
Customer 23 has arrived at 38
Customer 23 leaves at 40
Customer 24 has arrived at 39
Customer 24 leaves at 41
Customer 25 has arrived at 40
Customer 25 leaves at 45
Customer 26 has arrived at 45
Customer 26 leaves at 50
Customer 27 has arrived at 50
Customer 27 leaves at 53
Customer 28 has arrived at 55
Customer 28 leaves at 60
Customer 29 has arrived at 60
Customer 29 leaves at 66
Customer 30 has arrived at 65
Customer 30 leaves at 72
Customer 31 has arrived at 70
Customer 31 leaves at 72
Customer 32 has arrived at 75
Customer 32 leaves at 85
Customer 33 has arrived at 80
Customer 33 leaves at 83
Customer 34 has arrived at 85
Customer 34 leaves at 90
Customer 35 has arrived at 90
Customer 35 leaves at 98
Customer 36 has arrived at 95
Customer 36 leaves at 97
Customer 37 has arrived at 100
Customer 37 leaves at 102
Customer 38 has arrived at 105
Customer 38 leaves at 110
Customer 39 has arrived at 110
Customer 39 leaves at 115
Customer 40 has arrived at 115
Customer 40 leaves at 120
Customer 41 has arrived at 120
Customer 41 leaves at 125
Customer 42 has arrived at 125
Customer 42 leaves at 131
Customer 43 has arrived at 130
Customer 43 leaves at 137
Customer 44 has arrived at 135
Customer 44 leaves at 137
Customer 45 has arrived at 140
Customer 45 leaves at 143
Customer 46 has arrived at 145
Customer 46 leaves at 148
Customer 47 has arrived at 150
Customer 47 leaves at 155
Customer 48 has arrived at 155
Customer 48 leaves at 163
Customer 49 has arrived at 160
Customer 49 leaves at 163
Customer 50 has arrived at 165
Customer 50 leaves at 167
Customer 51 has arrived at 170
Customer 51 leaves at 175
Customer 52 has arrived at 175
Customer 52 leaves at 180
Customer 53 has arrived at 180
Customer 53 leaves at 185
Customer 54 has arrived at 185
Customer 54 leaves at 190
Customer 55 has arrived at 190
Customer 55 leaves at 196
Customer 56 has arrived at 195
Customer 56 leaves at 202
Customer 57 has arrived at 200
Customer 57 leaves at 202
Customer 58 has arrived at 205
Customer 58 leaves at 215
Customer 59 has arrived at 210
Customer 59 leaves at 213
Customer 60 has arrived at 215
Customer 60 leaves at 220
Customer 61 has arrived at 220
Customer 61 leaves at 228
Customer 62 has arrived at 225
Customer 62 leaves at 227
Customer 63 has arrived at 230
Customer 63 leaves at 232
Customer 64 has arrived at 235
Customer 64 leaves at 238
Customer 65 has arrived at 240
Customer 65 leaves at 245
Customer 66 has arrived at 245
Customer 66 leaves at 250
Customer 67 has arrived at 250
Customer 67 leaves at 255
Customer 68 has arrived at 255
Customer 68 leaves at 261
Customer 69 has arrived at 260
Customer 69 leaves at 267
Customer 70 has arrived at 265
Customer 70 leaves at 267
Customer 71 has arrived at 270
Customer 71 leaves at 280
Customer 72 has arrived at 275
Customer 72 leaves at 278
Customer 73 has arrived at 280
Customer 73 leaves at 285
Customer 74 has arrived at 285
Customer 74 leaves at 293
Customer 75 has arrived at 290
Customer 75 leaves at 292
Customer 76 has arrived at 295
Customer 76 leaves at 297
Customer 77 has arrived at 300
Customer 77 leaves at 305
Customer 78 has arrived at 305
Customer 78 leaves at 310
Customer 79 has arrived at 310
Customer 79 leaves at 315
Customer 80 has arrived at 315
Customer 80 leaves at 320
Customer 81 has arrived at 320
Customer 81 leaves at 326
Customer 82 has arrived at 325
Customer 82 leaves at 332
Customer 83 has arrived at 330
Customer 83 leaves at 332
Customer 84 has arrived at 335
Customer 84 leaves at 345
Customer 85 has arrived at 340
Customer 85 leaves at 343
Customer 86 has arrived at 345
Customer 86 leaves at 350
Customer 87 has arrived at 350
Customer 87 leaves at 358
Customer 88 has arrived at 355
Customer 88 leaves at 357
Customer 89 has arrived at 360
Customer 89 leaves at 362
Customer 90 has arrived at 365
Customer 90 leaves at 370
Customer 91 has arrived at 370
Customer 91 leaves at 375
Customer 92 has arrived at 375
Customer 92 leaves at 378
Customer 93 has arrived at 380
Customer 93 leaves at 385
Customer 94 has arrived at 385
Customer 94 leaves at 391
Customer 95 has arrived at 390
Customer 95 leaves at 397
Customer 96 has arrived at 395
Customer 96 leaves at 397
Customer 97 has arrived at 400
Customer 97 leaves at 410
Customer 98 has arrived at 405
Customer 98 leaves at 408
Customer 99 has arrived at 410
Customer 99 leaves at 415
Customer 100 has arrived at 415
Customer 100 leaves at 423
Customer 101 has arrived at 420
Customer 101 leaves at 422
Customer 102 has arrived at 425
Customer 102 leaves at 427
Customer 103 has arrived at 430
Customer 103 leaves at 435
Customer 104 has arrived at 435
Customer 104 leaves at 440
Customer 105 has arrived at 440
Customer 105 leaves at 445
Customer 106 has arrived at 445
Customer 106 leaves at 450
Customer 107 has arrived at 450
Customer 107 leaves at 456
Customer 108 has arrived at 455
Customer 108 leaves at 462
Customer 109 has arrived at 460
Customer 109 leaves at 462
Customer 110 has arrived at 465
Customer 110 leaves at 475
Customer 111 has arrived at 470
Customer 111 leaves at 473
Customer 112 has arrived at 471
Customer 112 leaves at 476
Customer 113 has arrived at 473
Customer 113 leaves at 481
Customer 114 has arrived at 474
Customer 114 leaves at 476
Customer 115 has arrived at 479
Customer 115 leaves at 481

[Old Pedant]

Questions:
What does the "lab5data.txt" file look like? A few sample lines, at least, would help.

Why do you call it a "circular queue"??? A bank line is a simple FIFO queue. Nothing circular about it. And I would implement a FIFO as a simple singly-linked list. Keep it simple. And efficient. You Queue class has the horrible limitation that it has a maximum size. To no advantage that I can see.

To implement the three Tellers, you obviously need a Teller class with 3 instances thereof. Without that, I don't see how you can write the simulation at all. Start with one instance, if you wish, but you need that instance.

[Old Pedant]

I also can't figure out why you need the Event class.

Maybe that's your equivalent of the Teller class, but I wouldn't have implemented it that way.