Threads Class Hierarchy OpenJDK (Ref thread.hpp)

Below is taken from hotspot\src\share\vm\runtime\thread.hpp file

Class hierarchy

Thread
   |-> NamedThread
          |-> VMThread
          |-> ConcurrentGCThread
          |-> WorkerThread
                  |-> GangWorker
                  |-> GCTaskThread
   |-> JavaThread
   |-> WatcherThread