Question

Please use JAVA program language

Discrete event simulation is to simulate events occurring at discrete time points. Between any two consecutive time points, no event occurs.

(a) Write a class Event with two integer instance variable time and type, which represents an event of a specific type occurs at time. Also write the constructor Event(int time, int type), which initializes the attributes using the parameters. In using this class, you can assume the getter and setter methods are available.

(b) Write a class Bank with an attribute eventList, which is a list of Event. Add a method generateEvents(int n) which generates n random customer arrival events (with event type 0) and put them into eventList in the order of increasing arrival times. The arrival time of the first customer is a random integer between 0 to 10 (inclusively). Similarly, after the first customer has arrived, the time to wait for the next customer to arrive, the interarrival time, is also a random integer between 0 to 10. Other future customer arrivals are similar. For example, if the first customer arrives at 3 and the next 2 interarrival times are 2 and 4, the actual customer arrival times are 3, 5 (=3+2) and 9 (=5+4)

(c) Write a method waitingTime(int serviceTime) of Bank which returns the average waiting time of the customers whose arrival times are in eventList, where serviceTime is the time each customer being served at the bank counter. In other words, the servicing time of each customer is the same.

Answer 1

SOURCE CODE: Java

*Please follow the comments to better understand the code.

**Please look at the Screenshot below and use this code to copy-paste.

***The code in the below screenshot is neatly indented for better understanding.

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Event.java
public class Event
{
    // fields
    private int time;
    private int type;

    // Constructor
    public Event(int time, int type) {
        this.time = time;
        this.type = type;
    }

    // Getters and Setters
    public int getTime() {
        return time;
    }

    public void setTime(int time) {
        this.time = time;
    }

    public int getType() {
        return type;
    }

    public void setType(int type) {
        this.type = type;
    }

    @Override
    public String toString() {
        return "Event{" +
                "time=" + time +
                ", type=" + type +
                '}';
    }
}

Bank.java

import java.util.*;
public class Bank
{
    ArrayList<Event> eventList;
    // (b)
    void generateEvents(int n)
    {
        // generate n random events
        eventList = new ArrayList<>();
        int arrivalTime = 0;
        for(int i=0;i<n;i++)
        {
            // create an event
            int time = new Random().nextInt(10);
            arrivalTime += time;
            Event event = new Event(arrivalTime, 0);
            // add that event to the list
            eventList.add(event);
        }
    }
    // (c)
    double waitingTime(int serviceTime)
    {
        double sum=0;
        // loop through the event list
        for(int i=1;i<eventList.size();i++)
        {
            int diff = eventList.get(i).getTime() - eventList.get(i-1).getTime();
            // check if the difference is negative
            if(serviceTime - diff  > 0) {
                // add the waiting time
                sum += serviceTime-diff;
            }
        }
        // return the average time
        return sum / eventList.size();
    }
}

TestBank.java

public class TestBank
{
    public 

• static void main(String[] args) {
          // create some 5 random events
          Bank bank = new Bank();
          bank.generateEvents(5);
          // print the events generated
          System.out.println("The Events are: "+bank.eventList);
  
          // calculate the average waiting time with service time 2
          System.out.println("The Average waiting time with service time=5 is: "+bank.waitingTime(5));
          System.out.println("The Average waiting time with service time=7 is: "+bank.waitingTime(7));
          System.out.println("The Average waiting time with service time=9 is: "+bank.waitingTime(9));
          System.out.println("The Average waiting time with service time=11 is: "+bank.waitingTime(11));
          System.out.println("The Average waiting time with service time=13 is: "+bank.waitingTime(13));
      }
  }