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Created the user class and now the organizer class extends from user.

Each organizer method stored in tanda needs to receive and organizer to be used.

I've created 2 arrayLists one with users to be randomized and the other with final users. The idea is that the organizer can randomize the order of the participants in each tanda and then select users to be given a turn. 

Once the user is in the final arrayList, it cannot be moved from there. The remaining users can still be randomized. If he wants to select the first user, the method only needs the organizer in matter. If he wants a different user, an index must be send.

Feel free to use the structure and mod it as you wish.