TestCourse

public class TestCourse {

    public static void main(String[] args) {

        Course course1 = new Course("Data Structures");

        Course course2 = new Course("Database Systems");

       

        course1.addStudent("Peter Jones");

        course1.addStudent("Brian Smith");

        course1.addStudent("Anne Kennedy");

       

        course2.addStudent("Peter Jones");

        course2.addStudent("Steven Smith");

       

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

        course1.getNumberOfStudents());

       

        String[] students = course1.getStudents();

        for(int i = 0; i < course1.getNumberOfStudents(); i++)

            System.out.print(students[i] + ", ");

        System.out.println();

       

        course1.dropStudent("Peter Jones");

       

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

                course1.getNumberOfStudents());

       

        students = course1.getStudents();

        for(int i = 0; i < course1.getNumberOfStudents(); i++)

            System.out.print(students[i] + ", ");

       

        System.out.println();

        System.out.print("Number of students in course2: " +

        course2.getNumberOfStudents());

    }

}

public class Course {

    private String courseName;

    private String[] students = new String[0];

    private int numberOfStudents = 0;

   

    public Course(String courseName) {

        this.courseName = courseName;

    }

   

    public String getCourseName() {

        return courseName;

    }

   

    public void addStudent(String studentName) {

        if(students.length <= numberOfStudents ) {

            String[] newStudents = new String[2 * students.length + 1];

            for(int i = 0; i < numberOfStudents; i++)

                newStudents[i] = students[i];

            students = newStudents;

        }

       

        students[numberOfStudents++] = studentName;

    }

   

    public void dropStudent(String studentName) {

        for(int i = 0; i < numberOfStudents; i++)

            if(students[i].equals(studentName))

                for(int k = i; i < numberOfStudents - 1;)

                    students[i] = students[++i];

        numberOfStudents--;

    }

   

    public int getNumberOfStudents() {

        return numberOfStudents;

    }

   

    public String[] getStudents() {

        return students;

    }

}

Number of students in course1: 3

Peter Jones, Brian Smith, Anne Kennedy,

Number of students in course1: 2

Brian Smith, Anne Kennedy,

Number of students in course2: 2