// Remote heap dump. The output (error message) can be read from the
    // returned input stream.

    public InputStream dumpHeap(Object ... args) throws IOException {

  {- -------------------------------------------
  (1) executeCommand() を呼び出し, 
      HotSpot に "dumpheap" 処理を実行させる.
      ---------------------------------------- -}

            return executeCommand("dumpheap", args);
        }