Why i am getting NullPointerException when accessing a member of Array of objects?

Question

This is where i am getting error

Student[] student = new Student[10];

System.out.println(" Test : " + student[2].RollNo);

But i do not get error when

Student student = new Student();

System.out.println(" Test : " + student.RollNo);

Error only shows up when i am creating array of objects.

The call "new array" creates the array, but all its slots are null initially. — GhostCat, Oct 26 '16 at 07:00
@user3861350 `student[2] = new Student();` (or do it in a loop) — Erwin Bolwidt, Oct 26 '16 at 07:03

score 0 · Answer 1 · answered Oct 26 '16 at 07:00

0

You have created an array with 10 slots that can contain Student object. You have not, however, put a student into the third slot hence the NPE

answered Oct 26 '16 at 07:00

Peter Gelderbloem

1 Answers1