The different kinds of actions are done by the following:
Forward Action,Include Action, DispatchAction.

Dispatch Action
The dispatch action is meant to be a workload reducer. It allows you to use
"org.apache.struts.actions.DispatchAction" to combine functions that are related into a single
action instead of having to create a new action for each required function. For example, within
a dispatch action you could include multiple forward actions.

IncludeAction:
<action path="/saveDetail" type="org.apache.struts.actions.IncludeAction"
name="detailForm" scope="request" input="/detail.jsp" parameter="/path to processing servlet">

ForwardAction:
<action path="/saveSubscription" type="org.apache.struts.actions.ForwardAction"
name="subscriptionForm" scope="request" input="/subscription.jsp"
parameter="/path/to/processing/servlet"/>

  public class UserAction extends DispatchAction  {
        public ActionForward add(ActionMapping mapping, ActionForm form,
         HttpServletRequest request, HttpServletResponse response) {
    }
        public ActionForward update(ActionMapping mapping, ActionForm form,
        HttpServletRequest request, HttpServletResponse response)
        throws Exception {
        UserForm userForm = (UserForm) form;
        userForm.setMessage("Inside update user method.");
        return mapping.findForward(SUCCESS);
  }
}

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