LookupDispatchAction class is much like the DispatchAction 
class except that, it uses a Java Map and 
ApplicationResource.properties file to dispatch methods. At 
run time, this class manages to delegate the request to one 
of the methods of the derived Action class. Selection of a 
method depends on the value of the parameter passed from 
the incoming request. LookupDispatchAction uses this 
parameter value to reverse-map to a property in the Struts 
Resource bundle file (ie..ApplicationResource.properties). 
this eliminates the need of creating an instance of 
ActionForm class.

Both LookupDispatchAction and DispatchAction are subclass 
of ActionClass.The Advantage of LookupDispatchAction is the 
methodName should be different.

LookupDispatchAction is used for I18N where as
DispatchAction is not useful for I18N