Beginning with version 7, Oracle's Java implementation is using Timsort for object arrays bigger than 10 elements, and Insertion sort for arrays with less than that number of elements. The same considerations apply for both Arrays.sort() and Collections.sort().

In older versions of Java, Merge sort was used instead of Timsort.


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Sandeep Joshi
Mathematics, Technology and Programming are my passion. I am a part of Java Ecosystem and through this blog, I contribute to it. I am here to blog about my interests, views and experiences.
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I feel proud to be listed as a "National Memory Record Holder" in the Limca Book of Records, 2009 and have attempted for an International Memory record in the Guiness Book of Records. I can remember the value of PI upto 10,000 digits after the decimal (3.1415.....). You can contact me on ; I would like to hear from you :)