Re: How to search object instances by their type ?

Why don't you use instanceof? 

Good point, sorry I forgot some info: I want to use a general method that searches for the widget types.

Details:

I have my own Widget tree (its root is called Elemento ;), It's a kind of builder pattern, that constructs GWT Element instances (I hope I can still use it in gwt 3.0 ;). 

Anyway it's contains the visitor pattern, to visit all contained Elemento instances. So a Elemento panel will visit all contained Elemento instances.

The visitor will then use the following general static Util method  (work in progress) to discover if it concerns the correct type:

public static boolean isInstanceOf(final Class<?> type, final Object obj) {
                if (isNotNull(type, obj)) {
                        if (type.equals(obj.getClass())) {
                                return true;
                        }
                        else {
                                Class<? extends Object> cls = obj.getClass();
                                while (isNotNull(cls) && !Object.class.equals(cls)) {
                                        if (type.equals(cls)) {
                                                return true;
                                        }
                                        cls = cls.getSuperclass();
                                }
                        }
                }
                return false;
        }

The alternative would be to use a Visitor for every know type and use the instanceof operator (instanceof requires the Object name). 

I understand I can't use reflection ;), but was still hoping to still use some general approach.

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