Sample Meeting Room Scheduler Design

Meeting Object

public class Meeting
{
    public long startTime;
    public long endTime;

    public Meeting(long sTime, long eTime)
    {
        startTime = sTime;
        endTime = eTime;
    }
}


Room Object

public class Room
{
    public List meetings;

    public Room()
    {
        meetings = new ArrayList();
    }
    public boolean tryScheduleMeeting(Meeting meeting)
    {
       for (Meeting scheduledMeeting : meetings) {
   if ((meeting.startTime < scheduledMeeting.endTime) && (meeting.endTime > scheduledMeeting.startTime))
                return false;
        }
     
        meetings.add(meeting);
        return true;
    }
}


Meeting Scheduler

public class Scheduler
{
    List rooms;

    public Scheduler()
    {
        rooms = new ArrayList();
    }
    public List scheduleMeetings(List meetings)
    {
       for (Meeting meeting : meetings)
        {
       
            boolean IsMeetingScheduled = false;
           for (Room room : rooms)
            {
                if (room.tryScheduleMeeting(meeting))
                {
                    IsMeetingScheduled = true;
                    break;
                }
            }

            if(!IsMeetingScheduled)
            {
                Room newRoom = new Room();
                newRoom.tryScheduleMeeting(meeting);
                rooms.add(newRoom);
            }
        }

        return rooms;
    }
 
    public static void main(String[] args)
    {
        List meetings = new ArrayList();
        Meeting m1 = new Meeting(8, 10);
        Meeting m2 = new Meeting(9, 10);
        Meeting m3 = new Meeting(10, 11);
        Meeting m4 = new Meeting(8, 12);

        meetings.add(m1);
        meetings.add(m2);
        meetings.add(m3);
        meetings.add(m4);

        Scheduler s = new Scheduler();
        List rooms = s.scheduleMeetings(meetings);
     
        System.out.println("Number of Rooms: "+ rooms.size());

        int i = 1;
        for (Room room : rooms)
        {
            System.out.println("Room: "+ i++);

            int j = 1;

            for(Meeting m : meetings)
            {
            System.out.println("Meeting: "+ j++);
            System.out.println("\tStart: "+ m.startTime);
            System.out.println("\t  End: "+ m.endTime);
           
            }
            System.out.println();
        }
    }
}