Still in the Prof class, create a public taking Midterm method which accepts and Observer object and adds it to your collection. Also, create a method that prints all students that are taking the midterm. Now, in your Secretary, add a method called registerToProf that adds itself to the objects that the Prof will notify: public void registerToProf (Prof p) { } p.addObserver (this); Add a similar method to the Student class but instead it should register to a Course instead of a Prof (you can get the Prof from the Course object). Call it registerToCourse. Finally, will need to implement the update methods for the Student, and Secretary classes! These will handle a notification from an Observable object that it is registered to. Here is the update method for the Student: * This method is called whenever the observed object is changed. An application calls an Observable object's * notifyObservers method to have all the object's * observers notified of the change. */ @param о @param arg @Override the observable object. an argument passed to the notifyObservers method. public void update (java.util. Observable o, Object arg) { if(arg instanceof Integer) { roomNumber = (Integer) arg; System.out.println("Student" + name + "has a midterm in room number: +roomNumber); } return; System.out.println("Student " + " name + says ..Doh got it dude!"); " System.out.println( ((Prof) o).getName() + says " + arg); ((Prof) o).taking TheMidterm (this); Implement a similar method in the Secretary, except it should return when the arg is an instance of Integer. Otherwise, assume the argument is the Date, set it to the instance variable for the Secretary, get a random integer between 1 and 10, and set that as the room number with the Prof's setRoomNumber method. Let's test this now! Create a class called University, that will contain the main method. In there, create a Prof object, a Course object, and 4 Student objects (call them Kramer, Elaine, Jerry, and George). Next, create a Secretary, and register it to the Prof. Register the Students to the course. Now, have the Prof set the midterm date, and then print all the students that are taking the midterm.