USING JAVA: Part A) Implement a superclass Appointment and subclasses Onetime, Daily, and Monthly. An Appointment has a description (for example, “See the dentist”) and a date. Write a method,                                           occuresOn(int year, int month, int day) The check whether the appointment occurs on that date. For example, for appointment, you must check whether the day of the month matches. This fill an array of Appointment objects with a mixture of appointments. Have the user enter a date and print out all appointments that occur on that date. Part B) Improve the appointment book by giving the user the option to add new appointments. The user must specify the type of the appointment, the description, and the date.

JAVA PROGRAMMING - Create an interface "Employee" which has the attribute: rate, and the method getSalary(); - Implement the Employee interface with two classes: Hourly and Commissioned. - Hourly employees has the following additional attribute: hoursWorked. Hourly wage is 300 money. - Commissioned employee has the following additional attribute: itemSold. Commissioned employees get 200 money per item. If item sold is greater than 100, any items sold after 100 has +10 money bonus. Inputs: 1. First line contains the type of Employee (Hourly or Commissioned) 2. Second line is for the hours worked or the items sold depending on the type of Employee. Output: Enter type of Employee: Hourly Enter hours worked: 10 Salary: 3000

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Complete the Course class by implementing the courseSize() method, which returns the total number of students in the course. Given classes: Class LabProgram contains the main method for testing the program. Class Course represents a course, which contains an ArrayList of Student objects as a course roster. (Type your code in here.) Class Student represents a classroom student, which has three fields: first name, last name, and GPA. Ex. For the following students: Henry Bendel 3.6 Johnny Min 2.9 the output is: Course size: 2 public class LabProgram {    public static void main (String [] args) {       Course course = new Course();            // Example students for testing      course.addStudent(new Student("Henry", "Bendel", 3.6));         course.addStudent(new Student("Johnny", "Min", 2.9));              System.out.println("Course size: " + course.courseSize());    } }   public class Student {     private String first;  // first name    private String last;   // last name    private…