  For horizonless spherical stars with uniform charge density, the hoop
conjecture was tested based on the interior solution. In this work, we are
interested in more general horizonless spherical charged stars. We test hoop
conjecture using the exterior solution since all types of interior solutions
correspond to the same exterior Reissner-Nordsr$\ddot{o}$m solution. Our
analysis shows that the hoop conjecture is violated for very compact stars if
we express the conjecture with the total ADM mass. And the hoop conjecture
holds if we express the conjecture using the mass in the sphere.
