🚀 go-pugleaf

Hi,
It's there again! I try to run a external process writen by C, so I use
Runtime() and get its getInputStream().... The first time when I put the
"begin_command" I really get the result from vprocess, and I hope the
vprocess would wait for the "second_command" then continue to finish its
process. I write the code below:

String init = begin_command;
try

    Runtime runtime = Runtime.getRuntime();
    Process vprocess = runtime.exec(init);
    is = new DataInputStream(vprocess.getInputStream());
    br = new BufferedReader(new InputStreamReader(is));
    os = new DataOutputStream(vprocess.getOutputStream());
    pr = new PrintWriter(new OutputStreamWriter(os),true);
} catch (IOException e) {}

public void do()
    String readin;
    try

        pr.write(second_command);
        while((readin = br.readLine()) != null)

            System.out.println(readin);
        }
    } catch (IOException e) {}
}

But I found "second_command" cannot be accept by vprocess, so I got nothing.
Where's wrong and how can I do?
Thanks advance!