How do I get the return code in Java after executing a windows command line command

Question

I'm doing something like this in Java right now

Process p = Runtime.getRuntime().exec("ping -n 1 -w 100 127.0.0.1")

How can I read the windows exec code? I already know how to read the command line output from the command, but what if I just want the 0 or 1 telling me whether it was successful or failed?

Answer 1

Use Process.exitValue() method. You will need to handle the exception thrown if the process has not yet exited and retry.

Or, you could use Process.waitFor() to wait for the process to end and it will return the process exit value also (thanks to increment1).