StudentCroup

package College;

public class StudentGroup {

    private String groupSubject;
    private Student[] students;
    private int freePlaces;

    StudentGroup() {
        this.students = new Student[5];
        this.freePlaces = 5;
    }

    StudentGroup(String groupSubject) {
        this();
        this.groupSubject = groupSubject;
    }

    void addStudent(Student newStudent) {

        if (this.freePlaces == 0) {
            System.out.println("Sorry " + newStudent.getName() + ", no free places left.");
            return;
        }
        if (!this.groupSubject.equalsIgnoreCase(newStudent.getSubject())) {
            System.out.println("Sorry " + newStudent.getName() + ", the group subject is " + this.groupSubject);
            return;
        }

        this.students[this.students.length-this.freePlaces] = newStudent;
        this.freePlaces--;
        System.out.println(newStudent.getName() + " enrolled successfuly for the course.");
    }

    void emptyGroup() {

        this.students = new Student[5];
        this.freePlaces = 5;
    }

    String theBestStudent() {

        Student bestStudent = students[0];
        for (int i = 1; i < students.length; i++) {
            if (students[i] == null) {
                break;
            }
            if (students[i].getGrade() > bestStudent.getGrade()) {
                bestStudent = students[i];
            }
        }

        return bestStudent.getName();
    }

    void printStudentsInGroup() {

        if (students == null) {
            System.out.println("No student has assigned for this course yet.");
            return;
        } else {
            for (int i = 0; i < students.length; i++) {
                if (students[i] != null) {
                    System.out.println("Name: " + students[i].getName());
                    System.out.println("Age: " + students[i].getAge());
                    System.out.println("Subject: " + students[i].getSubject());
                    System.out.println("Grade: " + students[i].getGrade());
                    System.out.println("Year in college: " + students[i].getYearInCollege());
                    System.out.println("Graduated: " + students[i].isDegree());
                    System.out.println("Money: " + students[i].getMoney() + "\n");
                } else {
                return;
                }
            }
        }
    }
}