Sample code to retrieve objects from HashMap in sorted ascending order?

Hi Friends, can u give code to convert ArrayList to HashMap and HashMap to ArrayList.

Can u give me sample code for ServiceImpl and DaoImpl, in j2ee .

In ActionClass we can use only one action i.e execute(), but in DispatchAction we can use multiple actions.My question is , we can use multiple actions in Action class if(action.equals("add") if(action.equals("update"). Then when to use Action and DispatchAction which is frequently in webapplications.

Hi friends can you give me sample code for Entire j2ee web application with struts and hibernate.I mean code for Dao, DaoImpl, HibernateDao ,HibernateDaoImpl, Dto , service , ServiceImpl , i.e.

Hi friends, can u explain Transparent Persistence in hibernate with sample code.

where singleton classes are used in j2ee web application.can we use it for connection pooling.

Hi Friends, why struts introduced in to web application. Plz dont send any links . Need main reason for implementing struts. Thanks Prakash

What are possible ways XML used in j2ee WebApplication.Like storing data in to database and for data transfer .Apart from this any uses.

Marker interface means , interface which has no methods.Then what is the necessity of its usage.I read "it tells the compiler that it should be treated differently ". "It is used to store state of an object". But still am not clear.Please explain clearly.