Proxy Design pattern
Proxy design pattern is one of the simplest design pattern. The name explains it all, we place a proxy class between the client and actual implementation. An example is EJB’s home and remote interface implementation. Or think of a webservice call, where we are trying to fetch Employee details from webservice. Instead of calling the webservice directly we bring in a proxy class, which is called by client and it call’s the actual webservice later. The advantage it gives us is that if the webservice call changes, say url for the call changes or pattern of input/ output xml is modifies, we just need to make change at one place, rather than changing calls at multiple clients.