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simona1@sfusd.edu arraylist1 > doubleList
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Given an ArrayList of Integers return a new ArrayList containing 2 elements for each element in the original list


doubleList([1, 2, 3]) → [1, 1, 2, 2, 3, 3]
doubleList([]) → []
doubleList([1, 2]) → [1, 1, 2, 2]

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public ArrayList <Integer> doubleList(ArrayList <Integer> nums) { }

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