Vector contains and Integer

Question

Hello
So far I tried to use a Vector to store different integers. I wrap them in an Integer object and add them to the Vector.
Since the user can select (from a JTree) multiple nodes and even the same node by clicking it again, I have to check if the ID is already stored in the Vector. But my implementation does not work - the contains method seems not to work for me. I guess I have a wrong understanding.
What happens is that if I click let's say on Node X with the ID of 5, the ID get's stored, but if I click on any other node contains returns true and the already stored node gets removed.
I'd be glad for any advise. This is the snippet:
            category_id = category.getCategory_id();           
            module_id = category.getModule_id();
            create = category.getCREAT();
            Integer categoryInt = new Integer(category_id);
            System.out.println("Value changed: "+category_id);
            if(categories.contains(categoryInt))
                 categories.remove(categoryInt);
            else
                 categories.add(categoryInt);Thank you. Regards
Tarik

Answer 1

Hi,
your snippet works. I have tried it and it does what
you expect. There must be something wrong in the
surrounding code. You already added that
System.out.println. Doesn't give this more
information?Thank you very much for the reply. I tested it with the System.out. but even though there were 3 dirfferent nodes selected the Vector always had a size of 1. I've replaced the Vector with a Hash Set and it worked that way.
But anyway thank you it's good that this question mark is cleared, so I do not have to discriminate Vector's :-) It must have been something else that was causing that problem.
Tarik.