question: return shutdownhookmanager singleton . concode_field_sep Runnable hook concode_elem_sep AtomicBoolean shutdownInProgress concode_elem_sep ShutdownHookManager MGR concode_elem_sep Log LOG concode_elem_sep int priority concode_elem_sep Set<HookEntry> hooks concode_field_sep boolean isShutdownInProgress concode_elem_sep boolean hasShutdownHook concode_elem_sep int hashCode concode_elem_sep List<Runnable> getShutdownHooksInOrder concode_elem_sep boolean equals concode_elem_sep void addShutdownHook concode_elem_sep boolean removeShutdownHook concode_elem_sep void run
target: ShutdownHookManager function ( ) { return MGR ; }