code: @Deprecated
      public Future<?> disconnect() {
          recordTermination();
          if (Util.isOverridden(Computer.class,getClass(),"disconnect",OfflineCause.class))
              // if the subtype already derives disconnect(OfflineCause), delegate to it
              return disconnect(null);
  
          connectTime=0;
          return Futures.precomputed(null);
      }
docs: Equivalent to {@code disconnect(null)}
  
  @deprecated as of 1.320.
  Use {@link #disconnect(OfflineCause)} and specify the cause.