java help

Question

I have such project https://code.sololearn.com/ceJzsHWJfRj0/#java
I have some problem with some part of code. I show using comment where is a problem.
Very thanks for the help. it's my sample exam from Programming:)

Answer 1

Hi. Your class Locator does not have a method add. The error says the same thing.

lokator.add(lokator);

Answer 2

it is must be just an empty method or what it must return?

Answer 3

I don't know 😀. It is your method.
What for is it used here? Depending oh that the answer can be found.
Also it is strange for me when object add itself to itself. Locator object already know about itself.