import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.ConcurrentMap; public class ConcurrentMapExample { public static void main(String[] args) { ConcurrentMapIn this example, we create a ConcurrentMap using ConcurrentHashMap. We then add some key-value pairs to the map and perform some operations like putIfAbsent(), remove() and replace(). These operations demonstrate how ConcurrentMap provides a safe and efficient way to manipulate a shared Map across multiple threads. The package library for ConcurrentMap is java.util.concurrent.map = new ConcurrentHashMap<>(); map.put("A", 1); map.put("B", 2); map.put("C", 3); // Print the map System.out.println("Initial map: " + map); // Trying to add a new entry with a key that already exists // The value should not be overwritten map.putIfAbsent("A", 100); System.out.println("After putIfAbsent(): " + map); // Trying to remove an entry with a specific key and value // Only the key-value pair that matches will be removed map.remove("B", 5); System.out.println("After remove(): " + map); // Trying to replace the value of an existing key // Only if the old value matches map.replace("C", 3, 300); System.out.println("After replace(): " + map); } }