Java SE (Java Platform, Standard Edition)

I am curious how would I read using BufferedReader inside JTextArea

For example:

JTextArea output;
int id;
BufferedReader in = new BufferedReader 
         (new InputStreamReader (System.in));

output.setText("Enter your  ID please: ");
id = Integer.parseInt (in.readLine()); // <-- would have worked if this was a standard console window
// How do I do the same as above just inside a JTextArea

Thanks guys