2. [10 points] Re-code the Course class, whose UML diagram is as follows.-courseName: String students: String[] Course-numberOfStudents: int +Course(courseName: String) +getCourseName(): String +addStudent(student: String): void +dropStudent(student: String): void +getStudents(): String[] +getNumberOfStudents(): int Use an ArrayList to replace an array to store students. 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.)