how to choose one view out of many in controller ( i don't want if/else because i might have many views)

Question

if ( accountType = "admin" )
        return admin view
if ( accountType = "customer" )
        return customer view
if ( accountType = "user" )
        return user view
if ( accountType = "merketing" )
        return marketing view

and so on .......

Answer 1

Use a map where you register your views with the given key:

viewsMap.put("admin", admin_view);
viewsMap.put("customer", customer_view);
...

and then, just do:

View view = viewsMap.get(accountType);
if (view == null) {
    return error_view;
}
return view;