taking data from recent output file

hello
I have called whlole c code from java and then as result of calling c code from java the output file is saved. I need to call c code several times from java and then I need to use the data from the output file to do some calculations. but my problem is how to make sure that the data taken from the output file is taken from recent output file and how to make sure that the output file is saved before executing next command in java???
thanks alot

Please give the glimpse of code here.

ok the code I have used to call c code from java is the following:

Code:

---

                        String line;
                        Process p = Runtime.getRuntime().exec("getting_output.exe");
                        BufferedReader input =new BufferedReader(new InputStreamReader(p.getInputStream()));

                        while ((line = input.readLine()) != null) {
                                System.out.println(line);
                        }

                        input.close();

---

I just have question if I want to execute c code from java several times and then read output file how can I make sure that I have read the most recent one
thanks

If you have closed the source, ie input.close(); then it should be saved at whatever the last modification was, and now is ready to be opened again.

That's my guess anyway, I know this works in C++ I had a same type of exercise.