Problem about Tomcat4.1.12 and Servlet

After Tomcat4.1.12 installed,running the servlet examples which kept in the webapps\examples\web-inf\classes, it ran fine. but when i copied the classes directory totally to webapps\ROOT\WEB-INF(default path for servlet in tomcat4.1.12)��� it could not run.
How can i do this ?
Thanks in advance.

But how can i do next?Because the destination directory is under ROOT which is the servlet default directory,after copied,the servlets should be run finely.but����

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    -------------------CODE-----------------------------
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