Java class variable that tracks number of objects instantiated

Question

I have this class, Student, with the variable StudentID:

public class Student extends Person{
  int studentID = 0;
  int level;

  public Student(){

  }         


        

Answer 1

You need a static variable to keep track of the number of students objects created.

public class Student extends Person{

    /* Number of students objects created */
    private static int studentCount = 0;   
    int studentID = 0;
    int level;

    public Student(String fName, String lName, int gLevel){
        super(fName, lName);
        if(gLevel >= 0 && gLevel <= 12){
            level = gLevel;
        }
        studentID = Student.getNextStudentId();
    }

    private static synchronized int getNextStudentId() {
        /* Increment the student count and return the value */
        return ++studentCount;
    }
}