PriorityQueue.poll() calls compareTo()?

I am implementing a `PriorityQueue` in my program. For that I have also implemented `compareTo()`. The `compareTo()` is being called when I perform `add()`, which is expected. But it is also called when I perform `poll()`.
I thought that the function of **poll()** is just to remove the head. Why does it need to call **compareTo()**?
Removing the head implies setting a new head when the data structure is a priority heap, which implies a comparison.

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