In this quick tutorial on how the Java HashMap works internally, you'll learn the following aspects: The basic syntax of the Java HashMap. How keys, values, hash codes and node references interact.

The ordinary HashMap is NOT Thread-Safe, It can have one null key and multiple null values. And we can impleemnt a HashMap like example below: HashMap is non-Synchronized in nature i.e. HashMap is not ...

While the Hashtable was part of the initial Java release over two decades ago, the HashMap is the correct key-value store to use today. When Java 2 was released, the architects of the language ...