[GitHub] [tomcat] larsgrefer opened a new pull request #271: Use empty arrays for Collections.toArray()

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larsgrefer opened a new pull request #271: Use empty arrays for Collections.toArray()
URL: https://github.com/apache/tomcat/pull/271
 
 
   There are two styles to convert a collection to an array:
   either using a pre-sized array (like `c.toArray(new String[c.size()])`)
   or using an empty array (like `c.toArray(new String[0])`).
   
   In older Java versions using pre-sized array was recommended,
   as the reflection call which is necessary to create an array of proper size was quite slow.
   However since late updates of OpenJDK 6 this call was intrinsified,
   making the performance of the empty array version the same and sometimes even better,
   compared to the pre-sized version.
   
   See also: https://shipilev.net/blog/2016/arrays-wisdom-ancients/

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