Can you list classes that implement the Map interface in Java?

The Java Map interface is implemented by several main classes from the standard library:

• HashMap — the most commonly used implementation, stores key-value pairs without order.
• LinkedHashMap — extends HashMap, maintains insertion order.
• TreeMap — implements a sorted map, elements are ordered by key (uses a red-black tree).
• Hashtable — an outdated synchronized implementation, now ConcurrentHashMap is more commonly used.
• ConcurrentHashMap — a thread-safe implementation for multi-threaded applications.

Example of using HashMap:

Map<String, Integer> map = new HashMap<>();
map.put("apple", 3);
map.put("banana", 5);
System.out.println(map.get("apple")); // 3