Question: (Java only) i am making a list of items, and in this list i need to be able to a)prevent duplicates in the arraylist b)

(Java only) i am making a list of items, and in this list i need to be able to a)prevent duplicates in the arraylist b) use a for loop to move an item on the list up for a specified number of moves c) move list up and down for example if the list is "milk egg plate move it to plate milk egg".

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