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Is the size() method the ArrayList class simply a getter, or does it perform any sort of calculation?
If it is a getter then is it safe to assume that it will be inlined at some point if I call it a large number of times?
If you’re asking if there’s any overhead in calling “size()”, the answer is “No”.
Here’s a similar discussion on a similar method, String.length():
In Java, for a string x, what is the runtime cost of s.length()? Is it O(1) or O(n)?
The answer in both cases – String.length() and ArrayList.size() – is “O(1)”.