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swapList


Swaps the elements at index1 and index2 of ArrayList a, then returns the array. Precondition: a will have a size of 2 or greater.


swapList([1, 3, 5, 7], 0, 3) → [7, 3, 5, 1]
swapList([1, 3, 99], 0, 1) → [3, 1, 99]
swapList([1, 3, 99], 1, 2) → [1, 99, 3]

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public ArrayList <Integer> swapList(ArrayList <Integer> a, int index1, int index2){ }

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