What are best practices for working with IdentityHashMap?

IdentityHashMap is a specialized implementation of the Map interface in Java that uses reference equality instead of object equality for keys. This unique behavior makes it suitable for specific applications where reference comparison is essential.

Java, IdentityHashMap, Map, best practices, performance, key-value pairs, reference equality

        // Example of IdentityHashMap in Java
        import java.util.IdentityHashMap;

        public class IdentityHashMapExample {
            public static void main(String[] args) {
                IdentityHashMap map = new IdentityHashMap<>();
                
                String key1 = new String("key");
                String key2 = new String("key");
                
                map.put(key1, "value1");
                map.put(key2, "value2");

                System.out.println("Map Size: " + map.size()); // Outputs 2
                System.out.println(map.get(key1)); // Outputs value1
                System.out.println(map.get(key2)); // Outputs value2
            }
        }

Java IdentityHashMap Map best practices performance key-value pairs reference equality

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