// Created by Jarticles.com:09/17/00, feel free to use
/**
 * This class gives you an idea of how the Servlet Engine works.
 */ 
public class SimpleServletEngine {
  public static void main(String args[]) throws Exception {
    if (args.length <= 0) {
      System.out.println("Usage: java SimpleServletEngine javaClassName");
      System.exit(0);  
    }
       
    System.err.println("loading class " + args[0] + "...");  
      
    Class cls = Class.forName(args[0]);
    Servlet servlet = (Servlet) cls.newInstance();
    servlet.init();
    servlet.service();
  }
}

/**
 * A class that extends Servlet interface directly.
 */
class MyServlet implements Servlet {
  public void init() {
    System.out.println("Calling MyServlet init()...");  
  }
  
  public void service() {
    System.out.println("I'm MyServlet");  
  } 
}

/**
 * A class that extends HttpServlet,thus implementing Servlet
 * interface automatically.
 */
class AnotherServlet extends HttpServlet {
  public void service() {
    System.out.println("I'm AnotherServlet"); 
  }
}

/**
 * An abstract class HttpServlet implementing Servlet Interface.
 */
abstract class HttpServlet implements Servlet { 
  public void init() {
    System.out.println("Calling HttpServlet init()...");  
  }
  
  // not implemented yet
  public abstract void service(); 
}

/**
 * Servlet Interface
 */
interface Servlet {
  public void init();
  public void service();  
}