2a) Draw a UML diagram for Course.java

2b)

complete Course.java class implementation and test it (5 points).

Cut following code and replace it with your completed implementation.

//Course.java

import java.util.ArrayList;

public class Course {

private String courseName;

private ArrayList students = new ArrayList();

private int numberOfStudents = 0;

private ArrayList grades=new ArrayList<>();

public Course(String courseName) {

this.courseName = courseName;

} public void addStudent(String student, String grade) {

students.add(student);

//Todo: add the grade to grades numberOfStudents++;

}

//to do: needs correct type public _____ getStudents() { return students;

}

//to do: needs correct type public _____ getGrades() { return grades;

} public int getNumberOfStudents() { return numberOfStudents;

} public String getCourseName() { return courseName;

}

//Todo: remove the student and the student's grade public void dropStudent(String student) {

/* TODO: find the index, so that students.get(index)==student then you can call students.remove(index) to remove the student from students. Similarly to remove the students's grade

*/

}

public int[] countGrades(){ //count: A+, A, A-, B+, B, B-, ..., D+, D, D-, F final String[] letter={"A+","A", "A-", "B+", "B", "B-", "C+", "C", "C-", "D+", "D", "D-", "F"}; int[] counts = new int[13];

//Todo: go over grades, compare each item with letter

//update counts return counts;

}

public static void main(String[] args) { Course course1 = new Course("Data Structures"); Course course2 = new Course("Database Systems");

course1.addStudent("Peter Jones", "A"); course1.addStudent("Brian Smith", "B"); course1.addStudent("Anne Kennedy", "B");

//add 5 more students

System.out.println("Number of students in course1: "

+ course1.getNumberOfStudents());

//Todo: add proper type, (String[] students is not correct)

_______ students = course1.getStudents();

//Todo: add proper type, (String[] grades is not correct)

_______ grades = course1.getgrades();

for (int i = 0; i < course1.getNumberOfStudents(); i++) //to do: print the Is students

System.out.print(students._____ + ": " + grades);

System.out.println();

//To do: Add code to print number of students got A+, A, A-

}

}