public void enroll() {
    // Get inside a loop, user hits Q to exit
    Scanner in = new Scanner(System.in);
    String course;
    do {
        System.out.print("Enter course to enroll (Q to quit): ");
        course = in.nextLine();
        courses = courses + "n" + course;
        tuitionBalance = tuitionBalance + costOfCourse;
    } while (course != "Q".toLowerCase());
    System.out.println("Enrolled in: " + courses);
    System.out.println("Tuition balance: " + tuitionBalance);
}