When when an arraylist’s logical size reaches its capacity, does it link a new array on to the end or does it make a new array and copy all the values into the new array?
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When when an arraylist’s logical size reaches its capacity, does it link a new array on to the end or does it make a new array and copy all the values into the new array?
That second one — it creates a new array and copies the old one over. If you want to avoid the copying, then you can use
LinkedListinstead, which does just add new links to a chain; but of course then you don’t get the fast indexing that a single array of elements provides.