TreeMap vs HashMap performance

Conclusions. HashMap is a general purpose Map implementation. It provides a performance of O(1) , while TreeMap provides a performance of O(log(n)) to add, search, and remove items . Hence, HashMap is usually faster.

Get the HashMap to be converted. Create a new TreeMap . Pass the hashMap to putAll() method of treeMap . Return the formed TreeMap .1 Eki 2021

HashMap is faster than TreeMap because it provides constant-time performance that is O(1) for the basic operations like get() and put(). TreeMap is slow in comparison to HashMap because it provides the performance of O(log(n)) for most operations like add(), remove() and contains().

HashMap allows storing at most one null key and many null values. However, TreeMap doesn’t allow a null key but may contain many null values . If we’re using a TreeMap with a user-defined Comparator, then it depends on the implementation of the compare() method how null values get handled.9 Nis 2020