Customer.java

/*
The Customer class represents a customer in the checkout queue simulation. Each 
customer has a number of items to checkout and timing information for their journey 
through the queue system.
*/


import java.util.*;

public class Customer {
    // Number of items the customer has
    private final int items;
    // When the customer enters the line
    private final int arrivalTime;
    // When the customer starts checkout
    private int startTime;
    // When the customer finishes checkout
    private int endTime;

    public Customer(int items, int arrivalTime) {
        this.items = items;
        this.arrivalTime = arrivalTime;
        this.startTime = -1;
        this.endTime = -1;
    }

    public int getItems() {
        return items;
    }

    public int getArrivalTime() {
        return arrivalTime;
    }

    public int getStartTime() {
        return startTime;
    }

    public int getEndTime() {
        return endTime;
    }

    public void setStartTime(int startTime) {
        this.startTime = startTime;
    }

    public void setEndTime(int endTime) {
        this.endTime = endTime;
    }

    @Override
    public String toString() {
        return "Customer{items=" + items + ", arrivalTime=" + arrivalTime + ", startTime=" + startTime + ", endTime=" + endTime + "}";
    }
}