Prediction Exercise - Ch 3

import java.util.*;
/**
 * Predict the output of the main() method.
 */
public class EventList
{
    private Queue<Event> events;
    public EventList()
    {
        events = new LinkedList<Event>();
    }
    public void addEvent(Event event)
    {
        events.add(event);
    }
    public Event getNext()
    {
        return events.peek();
    }

    public static void main(String[] args)
    {
        EventList list = new EventList();
        Event one = new Event("Stadium", new Date());
        list.addEvent(one);
        Event mine = list.getNext();
        System.out.println(mine);
        mine.setWhere("Gym");
        System.out.println(list.getNext());
        one.setWhere("Plaza");
        System.out.println(list.getNext());
    }
}
/** Event is something happening at a time and place */
class Event
{
    private String where;
    private Date   when;
    /** Create the event */
    public Event(String where, Date when)
    {
        this.where = where;
        this.when = when;
    }
    /** The event's location is changed */
    public void setWhere(String where)
    {
        this.where = where;
    }
    /** The event's time is rescheduled */
    public void setWhen(Date when)
    {
        this.when = when;
    }
    public String toString()
    {
        return where + ":" + when;
    }
}