I really need help on this please . in Java Tripleton (We call the design pattern "single"-ton because there can only be a single instance of the object. This canbe extrapolated to two, three, four, etc., instances as well. In this case, we'll build a tripleton (maximum ofthree instances).Building a tripleton is exactly the same as a singleton. You need to make the constructor private, and adda public static method called `getInstance to return an instance. In this case, the method will create newinstances while it can, and once it has created all three of them, it will return the 3rd instance. ThisTripleton class should also have a method called `getInstanceN` to retrieve the Nth instance.Put this Tripleton in a package called tripleton and create some tests in a main method there. Run a testto show that when you create a 4th instance, it is equal to the 3rd instance.UniversityIn this part of the lab, we'll implement the observer pattern. In this case, we'll be using a coupledeprecated packages in Java (do not use these for real applications, use java.beans) as they make itsimpler to understand the pattern.Create a Course class that has two instance variables: a course name, and a Prof object. Add getters forthose variables.Next, create the Prof class which extends java.util.Observable and is initialized with a name. It shouldhave a name, room number, a date for the midterm, and a collecton of Students.The Student should implement the Observer interface and is initialized with a name. It should have aname, room number, and a course variable.Add a Secretary class that also implements the Observer interface. It should only have a date as aninstance variable that will get set in it's update method later.In the Prof class, create a setter for the midterm date that also sets it's status to changed and notifies itsobservers with the Date like so:public void setMidterm (Date date) {midterm = date;// see why it is useful to have getters and setters!// we can now notify observers of the changesetChanged();notifyObservers ( date );Build a similar method for the room number. Still in the Prof class, create a public taking Midterm method which accepts and Observer object andadds 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 Profwill 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 (youcan 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 willhandle a notification from an Observable object that it is registered to. Here is the update method for theStudent:**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@paramargthe observable object.an argument passed to the notifyObserversmethod.@Overridepublic 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).takingTheMidterm (this);Implement a similar method in the Secretary, except it should return when the arg is an instance ofInteger. Otherwise, assume the argument is the Date, set it to the instance variable for the Secretary, geta random integer between 1 and 10, and set that as the room number with the Prof's setRoomNumbermethod.Let's test this now! Create a class called University, that will contain the main method. In there, create aProf 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 setthe midterm date, and then print all the students that are taking the midterm.

Question

I really need help on this please . in Java Tripleton (We call the design pattern &#34;single&#34;-ton because there can only be a single instance of the object. This canbe extrapolated to two, three, four, etc., instances as well. In this case, we'll build a tripleton (maximum ofthree instances).Building a tripleton is exactly the same as a singleton. You need to make the constructor private, and adda public static method called `getInstance to return an instance. In this case, the method will create newinstances while it can, and once it has created all three of them, it will return the 3rd instance. ThisTripleton class should also have a method called `getInstanceN` to retrieve the Nth instance.Put this Tripleton in a package called tripleton and create some tests in a main method there. Run a testto show that when you create a 4th instance, it is equal to the 3rd instance.UniversityIn this part of the lab, we'll implement the observer pattern. In this case, we'll be using a coupledeprecated packages in Java (do not use these for real applications, use java.beans) as they make itsimpler to understand the pattern.Create a Course class that has two instance variables: a course name, and a Prof object. Add getters forthose variables.Next, create the Prof class which extends java.util.Observable and is initialized with a name. It shouldhave a name, room number, a date for the midterm, and a collecton of Students.The Student should implement the Observer interface and is initialized with a name. It should have aname, room number, and a course variable.Add a Secretary class that also implements the Observer interface. It should only have a date as aninstance variable that will get set in it's update method later.In the Prof class, create a setter for the midterm date that also sets it's status to changed and notifies itsobservers with the Date like so:public void setMidterm (Date date) {midterm = date;// see why it is useful to have getters and setters!// we can now notify observers of the changesetChanged();notifyObservers ( date );Build a similar method for the room number. Still in the Prof class, create a public taking Midterm method which accepts and Observer object andadds 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 Profwill 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 (youcan 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 willhandle a notification from an Observable object that it is registered to. Here is the update method for theStudent:**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@paramargthe observable object.an argument passed to the notifyObserversmethod.@Overridepublic void update (java.util. Observable o, Object arg) {if (arg instanceof Integer) {roomNumber = (Integer) arg;System.out.println(&#34;Student &#34; + name + &#34; has a midterm in room number:+ roomNumber);return;}System.out.println(&#34;Student &#34; + name +says ..Doh got it dude!&#34;);&#34;System.out.println( ((Prof)o).getName() + &#34; says + arg);((Prof)o).takingTheMidterm (this);Implement a similar method in the Secretary, except it should return when the arg is an instance ofInteger. Otherwise, assume the argument is the Date, set it to the instance variable for the Secretary, geta random integer between 1 and 10, and set that as the room number with the Prof's setRoomNumbermethod.Let's test this now! Create a class called University, that will contain the main method. In there, create aProf 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 setthe midterm date, and then print all the students that are taking the midterm.

Accepted Answer

Algorithm:Define classes for Tripleton, TripletonTest, Course, Prof, Student, and…