Question

What advantage does TreeMap have over HashMap?

a) Faster lookup times
b) Unordered key-value pairs
c) Lower memory usage
d) No key-value pairs

Answer 1

The advantage of TreeMap over HashMap is ordered key-value pairs, lower memory usage, and efficient retrieval of sorted lists.

Step-by-step explanation:

The advantage that TreeMap has over HashMap is ordered key-value pairs. While HashMap does not guarantee any particular order of its elements, TreeMap stores its key-value pairs in a specific order based on their keys. This allows TreeMap to be useful in scenarios where you need to iterate through the elements in a specific order or perform operations such as finding the smallest or largest key.

For example, if you have a TreeMap with keys representing students' grades, you can easily find the highest or lowest grade by using the firstKey() or lastKey() methods. In a HashMap, you would need to iterate through all the keys to find the highest or lowest grade.

Other advantages of TreeMap over HashMap include lower memory usage due to its binary search tree implementation and the ability to efficiently retrieve a sorted list of keys or values.