difference between doGet and doPost methods in servlets

what is the difference in doGet and doPost Methods in java
servlets.
can anyone clearly explain
appreciate your help

You had not posted your question in a right forum...

Moving this to Servlets...
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Valentin Crettaz
Sun Certified Programmer for Java 2 Platform

http://java.sun.com/j2ee/j2sdkee/techdocs/api/index.html
Or, more specifically:
http://java.sun.com/j2ee/j2sdkee/techdocs/api/javax/servlet/http/HttpServlet.html
This is basic stuff - I would suggest getting (and reading) a book on Servlets or finding some online tutorials about servlets (java.sun.com just happens to have several). It will save you a lot of grief and answer a lot of your questions.

protected void doGet(HttpServletRequest req,
HttpServletResponse resp)
Called by the server (via the service method) to allow a servlet to handle a GET request.

protected void doPost(HttpServletRequest req,
HttpServletResponse resp)
Called by the server (via the service method) to allow a servlet to handle a POST request. The HTTP POST method allows the client to send data of unlimited length to the Web server a single time and is useful when posting information such as credit card numbers.

For examples of what GET and POST look like, check this:
http://www.javaranch.com/ubb/Forum7/HTML/006990.html

short version:
any 'normal' request (like if you click the link above) is a GET
If you are submitting a form, depending on the method attribute of your HTML form, you either GET or POST that data.