java - Converting ArrayList into TreeSet -

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i have arraylist<card> cards = new arraylist<card> need convert treeset<card>. purpose do:

new treeset<card>(cards)

after have size of treeset equal 1. card class implements comparable interface. i'm doing wrong or not doing?

if of cards in arraylist evaluate equal using provided comparable interface (i.e. compare returns 0) end 1 entry in treeset.


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