question: public String toString ( ) { long ncompleted ; int nworkers , nactive ; final ReentrantLock mainLock = this . mainLock ; mainLock . lock ( ) ; try { ncompleted = completedTaskCount ; nactive = 0 ; nworkers = workers . size ( ) ; for ( Worker w : workers ) { ncompleted += w . completedTasks ; if ( w . isLocked ( ) ) ++ nactive ; } } finally { mainLock . unlock ( ) ; } int c = ctl . get ( ) ; String rs = ( runStateLessThan ( c , SHUTDOWN ) ? "Running" : ( runStateAtLeast ( c , TERMINATED ) ? "Terminated" : "Shutting down" ) ) ; return super . toString ( ) + "[" + rs + ", pool size = " + nworkers + ", active threads = " + nactive + ", queued tasks = " + workQueue . size ( ) + ", completed tasks = " + ncompleted + "]" ; }
target:  Returns a string identifying this pool, as well as its state, including indications of run state and estimated worker and task counts.