X1367: ArrayStack - push

In this second problem, you will complete the push() method. This method adds an element to the top of the stack stored in the instance variable (stack) you created in the previous problem. Worthy of note, a stack is a LIFO - last in, first out structure. You always add at one end of the linear structure and remove from the same end. You might want to look at the documentation for ArrayList to refresh your memory of how to use that class.

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