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frew@mclean.com list-1 > listFirst7
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Ensure the list's first element is 7. The list may be empty.


listFirst7([1, 4, 9]) → [7, 1, 4, 9]
listFirst7([3, 4, 7, 9]) → [7, 3, 4, 7, 9]
listFirst7([7, 9, 3, 4]) → [7, 9, 3, 4]

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public ArrayList<Integer> listFirst7(ArrayList<Integer> list) { }

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