Render a calendar - EPI

Render a calendar 

RenderingCalendar.java

  public static class Event {
    public int start, finish;

    public Event(int start, int finish) {
      this.start = start;
      this.finish = finish;
    }

    // @exclude
    @Override
    public String toString() {
      return "[" + start + "," + finish + "]";
    }
    // @include
  }

  private static class Endpoint implements Comparable<Endpoint> {
    public int time;
    public boolean isStart;

    public int compareTo(Endpoint e) {
      if (time != e.time) {
        return Integer.compare(time, e.time);
      }
      // If times are equal, an endpoint that starts an interval comes first.
      return isStart && !e.isStart ? -1 : !isStart && e.isStart ? 1 : 0;
    }

    Endpoint(int t, boolean is) {
      time = t;
      isStart = is;
    }
  }

  public static int findMaxSimultaneousEvents(List<Event> A) {
    // Builds an array of all endpoints.
    List<Endpoint> E = new ArrayList<>();
    for (Event event : A) {
      E.add(new Endpoint(event.start, true));
      E.add(new Endpoint(event.finish, false));
    }
    // Sorts the endpoint array according to the time, breaking ties
    // by putting start times before end times.
    Collections.sort(E);

    // Track the number of simultaneous events, and record the maximum
    // number of simultaneous events.
    int maxNumSimultaneousEvents = 0, numSimultaneousEvents = 0;
    for (Endpoint endpoint : E) {
      if (endpoint.isStart) {
        ++numSimultaneousEvents;
        maxNumSimultaneousEvents
            = Math.max(numSimultaneousEvents, maxNumSimultaneousEvents);
      } else {
        --numSimultaneousEvents;
      }
    }
    return maxNumSimultaneousEvents;
  }