  The Janis-Newman-Winicour (JNW) spacetime possesses a naked singularity,
although it represents an exact particle-like solution to the
Einstein-Klein-Gordon theory with a massless scalar field. Here, we investigate
the possible formation of a naked singularity in the JNW spacetime, using the
thin-shell approximation to describe the gravitational collapse. By introducing
different matter contents to construct thin-shells, we demonstrate the
impossibility of naked singularity formation during the gravitational collapse
unless the causality or null energy condition of the thin-shell is violated.
Therefore, the weak cosmic censorship is satisfied even with the naked
singularity of the JNW spacetime.
