Friday, 18 March 2016

How to Reverse an ArrayList in Java using Recursion - Example Tutorial

If you ever need to reverse a List in Java e.g. ArrayList or LinkedList, you should always use the Collections.reverse() method. It's safe and tested and probably perform better than the first version of the method you write to reverse an ArrayList in Java. It's also one of the recommended best practice to prefer library method instead of writing your own, as advised by great Joshua Bloch in Effective Java. There are so many benefits of using library method e.g it was written by experts, thoroughly and open source tested and more actively maintained. Anyway, if you have been asked to write a function to reverse a List using recursion in Java, may be as part of your homework, assignment or during an interview, then you are in the right place. In this tutorial, I'll show you how to reverse an ArrayList of String using recursion. You can use this technique to reverse any type of List e.g. List of Integer, List of String or List of your own custom objects.
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