InputStream and OutputStream - Already opened for input

Question

URL url = new URL("website.com");
        URLConnection urlc = url.openConnection();
        urlc.setDoOutput(true);
        urlc.setDoInput(true);
        urlc.setUseCaches(false);
// read something from a file
        BufferedReader reader = new BufferedReader(new InputStreamReader(urlc.getInputStream()));
        while (reader.read() > 0) {
            // do something
        reader.close();
// write something to the same file
        DataOutputStream dos = new DataOutputStream(urlc.getOutputStream());
        dos.writeBytes("write something");
        dos.close();"java.io.IOException: Already opened for input:"
what is that supposed to mean? Doesn't "reader.close();" take care of that?
I can read the file and I can write to a file. But I can't do both one after another...
Why is that?

Answer 1

I just swapped the code
URL url = new URL("website.com");
        URLConnection urlc = url.openConnection();
        urlc.setDoOutput(true);
        urlc.setDoInput(true);
        urlc.setUseCaches(false);
// write something to the same file
        DataOutputStream dos = new DataOutputStream(urlc.getOutputStream());
        dos.writeBytes("write something");
        dos.close();
// read something from a file
        BufferedReader reader = new BufferedReader(new InputStreamReader(urlc.getInputStream()));
        while (reader.read() > 0) {
            // do something
        reader.close();