import java.util.*;
import java.util.regex.*;


class rTest {
  public static void main (String[] args) {

    String s  = "public class hello extends jframe";

    Pattern p = Pattern.compile("public\\s*class\\s+(\\S+)");
    Matcher m = p.matcher(s);

    if (m.find()) {
        System.out.println("found");
        String className = m.group(1);
        System.out.println(className);
    }

  }
}