Read from standard input and exit in case of empty line or control Z in Java

/*from  www .  j  av  a  2 s  .c  om*/
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    String s;
    while ((s = in.readLine()) != null && s.length() != 0) {
      System.out.println(s);
    }
    // An empty line or Ctrl-Z terminates the program
  }
}