  A study of an interacting system of bosons in a ring trap at a finite
temperature is presented. We consider a gas with contact and long-range dipolar
interactions within a framework of the classical fields approximation. For a
repulsive gas we have obtained coherence length, population of the ground state
and its fluctuations as a function of temperature. In the case of an attractive
gas we study local density fluctuations. Additionally, we exactly calculate the
partition function for the ideal gas in the canonical ensemble and derive
several other macroscopic state functions.
