X1363: ArraySet - add()

In this second problem, you will complete the add() method. This method adds an element to the end of the instance variable (set) you created in the previous problem. Worthy of note, a set does not allow duplicates. So, your add() method should check if the element is contained in the set already. If it is, then don't add it and return false. If it is not in the set already, 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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