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Why? Is it faster or more efficient?
For systems with one core, we can use quicksort. What should we use on systems with two cores, four cores, or eight cores?
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Quick sort is an in-place sorting algorithm. In-place sorting means no additional storage space is needed to perform sorting. Merge sort requires a temporary array to merge the sorted arrays and hence it is not in-place giving Quick sort the advantage of space.
Arrays. sort() does not use quick-sort. Java 7 used TimSort which is a combination of Merge Sort and Insertion Sort. Java 8 uses parallel-sort when there are more number of elements, and uses multiple threads for sorting.
No other sorting algorithm performs better than Quick sort on Arrays because of the following reasons: Quick sort is an in-place sorting algorithm, i.e. which means it does not require any additional space, whereas Merge sort does, which can be rather costly.
As mentioned in the official JavaDoc, Arrays. sort uses dual-pivot Quicksort on primitives. It offers O(n log(n)) performance and is typically faster than traditional (one-pivot) Quicksort implementations. However, it uses a stable, adaptive, iterative implementation of mergesort algorithm for Array of Objects.
Quicksort has the advantage of being completely in place, so it does not require any additional storage, while mergesort (which is actually used by Arrays.sort() for object arrays) and other (all?) guaranteed O(n*log n) algorithm require at least one full copy of the array. For programs that sort very large primitive arrays, that means potentially doubling the overall memory usage.
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