Facade Design Pattern

The facade pattern collects a group of related objects and provides a single user interface to access these objects.

public abstract class Event {
      protected Calendar date;
      protected String place;
      protected String topic;

      public Event (Calendar date, String place, String topic) {
            this.date = date;
            this.place = place;
            this.topic = topic;
      }

      public abstract void addToSchedule();
}


public class Meeting extends Event {
   
      public void addToSchedule() {
            //add meeting to schedule
      }
}


public class Interview extends Event {
      public void addToSchedule() {
            //add interview to schedule
      }
}


//The single user interface
public class EventScheduler {
      private Event event;

      public void scheduleMeeting(Calendar d, String p, String t) {
            event = new Meeting(d, p, t);
            event.addToScehdule();
      }

      public void scheduleInterview(Calendar d, String p, String t) {
            event = new Interview (d, p, t);
            event.addToScehdule();
      }
}

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