public EmailFolder(String label) Assume the variable folders is an array list of EmailFolder objects. Write code to add a new EmailFolder to the list.

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…

public class VisitorPackage{// Declare data fields: an int named travelerID, // a String named destination, and // a double named totalCost.// Your code here... // Implement the default contructor.// Set the value of destination to N/A, and choose an // appropriate value for the other data fields,// Your code here... // Implement the overloaded constructor that passes new// values to all data fields.// Your code here... // Implement method getTotalCost to return the totalCost.// Your code here... // Implement method applyDiscount.//// This method applies a discount off of the total cost// of the tour. The way the discount is applied depends// on the kind of visitor.//// Child discount: the unit discount is subtracted ONCE// from the total cost of the tour.// Senior discount: the unit discount is subtracted TWICE// from the total cost of the tour.// Parameters:// - a char to indicate the kind of visitor// ('c' for child, 's' for senior)// - a double that indicates the amount of the…

Elevator simulation. I need help fixing this class The Simulation Class initializes and holds objects for Passengers, Elevators, and Floors. It reads and parses input files to create the necessary objects and sets the number of simulation iterations. The class also has methods to move the elevators up and down the building, as well as to pick up and drop off passengers. public class Simulation {    private int numFloors;    private ArrayList<Passenger> passengers;    private ArrayList<Elevator> elevators;    private ArrayList<Floor> floors;    private int numIterations;     public Simulation(String inputFile) throws FileNotFoundException {        passengers = new ArrayList<>();        elevators = new ArrayList<>();        floors = new ArrayList<>();         // Read input file and initialize simulation parameters        Scanner scanner = new Scanner(new File(inputFile));        while (scanner.hasNextLine()) {            String line =…