The place you kept file  is right just type below in
the browser
http://127.0.0.1:8080/servlets/hello
it will run
Although folder name is different but even I have to
try for five hours to get the correct  syntax

For Running The Serlet(.java) File Try These Url
"http://127.0.0.1:8080/servlets-examples\servlet\Hello"
The Problem is U Don't Not Use
WEB-INF\CLASSES
in Your Url
For Servlet Running U Need To Give The New Created Folder (in Your Case
servlet-examples).Then Put Your Servlet .class File in
WEB-INF/classes
Then Use The Above Url You'll Get The Result

the procedure is as follows:-

1)execute the pgm to get .class file

2)copy .class file  to

if your tomcat  is in d:(assume)

d:\tomcat4.1\webapps\root\web-inf\class folder

if html file is also there then copy  html file to

d:\tomcat4.1\webapps\root folder

3)change the XML file and give the url  name

4)start tomcat server

5)call the servlet from the browser

and type the following in the html page

http://localhost:<port number>/<urlname>