Rewrite the Course class in Listing 10.6. Use an ArrayList to replace the array to store students. Draw a new UML diagram for the class. You should not change the original contract of the Course class (i.e., the definition of the constructors and methods should not be changed, but the private members may be changed.)

public class Course private String courseName; private String[] students = new String[100]; private int numberOfStudents; public Course(String courseName) this. courseName = courseName; public void addStudent (String student) students [numberOfStudents] -student; numberOfStudents++ public String[] getStudentsO f return students; public int getNumberOfStudentsO f return numberOf Students; public String getCourseNameO return courseName; public void dropStudent(String student) // Left as an exercise in Programming Exercise 10.9