Java Tutorial/Servlet/Thread

Servlet With Thread

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
public class MyServlet extends HttpServlet implements Runnable {
  long lastprime = 0;                    
  Date lastprimeModified = new Date();   
  Thread searcher;
  public void init() throws ServletException {
    searcher = new Thread(this);
    searcher.setPriority(Thread.MIN_PRIORITY);
    searcher.start();
  }
  public void run() {
    long candidate = 2;
    while (true) {     
      candidate += 2;                    
      try {
        searcher.sleep(5000);
      }
      catch (InterruptedException ignored) { }
      lastprime = 1;   
    }
  }
  public void doGet(HttpServletRequest req, HttpServletResponse res)
                               throws ServletException, IOException {
    res.setContentType("text/plain");
    PrintWriter out = res.getWriter();
    if (lastprime == 0) {
      out.println("Still searching for first prime...");
    }
    else {
      out.println("The last prime discovered was " + lastprime);
      out.println(" at " + lastprimeModified);
    }
  }
  public void destroy() {
    searcher.stop();
  }
}