请问process.getInputStream()的有关问题

Process process = Runtime.getRuntime().exec ("cmd.exe");               BufferedReader   bufferedReader   =   new   BufferedReader(   new   InputStreamReader(process.getInputStream()));                      String line;                   while ((line = bufferedReader.readLine ()) != null)               {                 System.out.println(line);                 System.out.flush();                }