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I’m using Collection.sort(Array<objectX>, Comperator<objectX>) in java/Android.
In my comperator I compare two objects using their ID.
How can I know in which method this sort is made? (quicksort, mergesort…)?
Technically speaking which algorithm to use is not specified (in other words it’s runtime library specific).
From the documentation:
In practice, it typically chooses one sorting technique of of several based on the length of the list etc. In the standard implementation from Sun/Oracle it chooses between insertion sort (if the length is less than 7) and merge sort otherwise.