TreeMap: HashMap Sorting

How to sort a HashMap by key and value is one of the most important interview questions employers ask, and there is no single answer to it. This topic requires some knowledge of TreeMap, which we will discuss in this lesson.

Let’s discuss some of the ways to sort a HashMap.

Using a TreeMap

Elements are stored in a TreeMap in sorted order by default, we can create a TreeMap and then add all the elements from our HashMap to the TreeMap using the putAll() method.