X1363: ArrayListSet - add()

In this exercise, you will continue building the ArrayListSet class by completing the add() method. This method adds an element to the end of the instance variable set (of type ArrayList) that you created in the previous exercise. Worthy of note, a set does not allow duplicates. So, your add() method should check if the element is already in the set. If it is, then don't add it (do nothing) and return false. If it is not in the set, then add it and return true.

You might want to look at the documentation for ArrayList to refresh your memory of how to use that class.

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