What types of Map interface implementations have you used in your projects?

In Java projects, I used several main implementations of the Map interface:

• HashMap — the most common implementation, provides fast insertion and lookup of elements by key (average O(1)). Used when the order of elements is not important.

• LinkedHashMap — maintains the insertion order of elements, which is useful if you need to iterate over elements in the same order they were added.

• TreeMap — implements the SortedMap interface, stores keys in sorted order (by natural order or using a Comparator). Used when ordered access to elements is important.

Example of using HashMap:

Map<String, Integer> map = new HashMap<>();
map.put("apple", 3);
map.put("banana", 5);
int count = map.get("apple");