HashMap vs TreeMap vs LinkedHashMap: Key Differences Explained
HashMap vs TreeMap vs LinkedHashMap Introduction Java's Map interface, a crucial part of the Collections Framework, is where key-value pairs are stored. HashMap , TreeMap , and LinkedHashMap are three of the most extensively used Map interface implementations. Despite the fact that all three classes have the basic function of storing key-value pairs, there are significant differences in their internal implementations, performance characteristics, and use cases. Overview of HashMap, TreeMap, and LinkedHashMap HashMap HashMap in Java is like the legacy Hashtable class, but it is not synchronized. In addition to allowing us to store null elements, there should only be one null key. Since Java 5, it has been expressed as HashMap, where V is the value and K is the key. It implements the Map interface and inherits the AbstractMap class. The Map interface, which is implemented by the Java HashMap class, enables us to store key-value pairs in which the keys must differ. The ele...