This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
You are attempting to iterate over players.get(i); I don't know what that returns, but your error message indicates it is not iterable. I would have expected it to be a player, and a Player object to have a method that returns a collection of cards (getCards(), getHand(), something like that). Perhaps you need something like players.get(i).getCards().