Web Reference: Jan 19, 2026 · Previously, Java's Arrays.sort method used Quicksort for arrays of primitives and Merge sort for arrays of objects. In the latest versions of Java, Arrays.sort method and Collection.sort () uses Timsort. If you want to sort based on ReportKey first then Student Number then School, you need to compare each String instead of concatenating them. Your method might work if you pad the strings with spaces so that each ReportKey is the same length and so on, but it is not really worth the effort. Feb 3, 2026 · Each sub-array is sorted with Arrays.sort () in different threads so that sort can be executed in a parallel fashion and are merged finally as a sorted array. Note that the ForkJoin common pool is used for executing these parallel tasks and then merging the results.
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Last Updated: April 7, 2026
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