Java class return windows command line information -

I am able to execute a command from the command line with the code given below. I pass the command to work the code So this process does and gives me the return value. What do I need to get a response from the command line when it does not process correctly, so if I pass a command at the prompt and execute it then I get a value I if I command a command But if I pass and fail, I do not get any value. Here is my code

  public string command line accesskey return (string location) {string return value = ""; String Out Value = Null; Try {procedure p = runtime.gettime (). Exec ("cmd.exe / c" + loc); BufferedReader = new BufferedReader (new InputStreamReader (p.getInputStream ()); String line = null; While ((line = in.readline ())! = Null (); ReturnValue = Line; }} Hold (IOException e) {string water SW = new stringwriter (); E.printStackTrace (new print WRITER (sw)); String Stacktrace = sw.toString (); ReturnValue = stacktrace; } Return return value; }    
 
 
 error stream ( p.getErrorStream) ) - Note that two threads will be required to read from both the streams.  
 Alternatively, you can use it more easily and can call its  redirectErrorStream (true)  method.  
 Also see.