How to convert a String which contains integers to an integer

Question

Hi, I'm doing a simple user-interaction program. For example I ask how many people are in a group. and they give me an answer with a integer number. But how can I convert the System.in to an real integer value, i.e. How can a String value which contain an integer convert to an integer value?
InputStreamReader inputStreamR = new                               InputStreamReader(System.in);
BufferedReader bufR = new BufferedReader(inputStreamR);
String ans = bufR.readLine();
and then what? (I want the answer is an integer);
Thanks

Answer 1

String ans = bufR.readLine();
try {
  int ansAsInt = Integer.parseInt(ans);
} catch (NumberFormatException nfe) {
  // What happens if the String was not an integer
}