checks whether the reference object has been enqueued . concode_field_sep Reference<?> pendingNext concode_elem_sep T referent concode_elem_sep Reference queueNext concode_elem_sep ReferenceQueue queue concode_field_sep boolean enqueue concode_elem_sep T get concode_elem_sep void clear concode_elem_sep boolean enqueueInternal
boolean function ( ) { return queueNext != null ; }