GenericServlet Full structure sample Example

package com.nareshit.servlets;
import javax.servlet.*;
public class Helloworld implements servlet
{
public Helloworld()
{
System.out.println("Constructor");
}
public void init(ServletConfig config)
{
System.out.println("Init method");
}
public void service(ServletRequest r,ServletResponse res)
{

System.out.println("Hello world");   
}
public void destroy()
{
System.out.println("destroy method");
}
public string getServletInfo()
{
return "Hai";
}
public servletConfig getServletConfig()
{
return null;
}
}