Remember the code?

#!/bin/sh
 
# This is our real simple sub routine returns 0 value when it is happy
is_happy ()
{
     #First arg $1, Second arg  $2, third $3 ... so on.
     if [ "$1" = ":)" ] ; then
     	return 0
     else
     	return 1
     fi
}

#!/bin/sh
#including the lib.inc file
. lib.inc
 
#calling subroutine
is_happy ":)"
 
if [ "$?" -eq 0 ] ; then
        echo "I am happy!"
else
        echo "No I am not happy!"
fi

import javax.servlet.* ; // Filter and FilterChain are located here
public class BeerRequestFilter implements Filter {
	private FilterConfig fc;
 
	//You must implement init & destroy methods
	public void init (FilterConfig config) throws ServletException {
		this.fc=config;
	}
	// doFilter args are not HttpServletRequest and HttpServletResponse.
	public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws
			ServletException, IOException {
		HttpServletRequest httpReq = (HttpServletRequest) req; 
		// This casting is possible because the req is in fact HttpServletRequest!
 
		String name = httpReq.getRemoteUser();
		if(name != null) {
			fc.getServletContext().log("User " + name + " is updating" );
		}
		chain.doFilter(req.resp); //calling next filter
	}
	//You are required to implement destroy()
	Public void destroy(){
	}
}