The powere of HashMap in Java

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Most developers use maps to store and get data especially HashMaps, but most of theme dont know how to use it or understand how  HashMaps works.  in this post , i’ll explain how the java.util.HashMap works , we will see different examples of HashMap, like adding and removing entries, iterating over Java HashMap, checking size map, finding if a key or value exists on Map and various other examples, which we used frequently.

The HashMap class uses a hashtable to implement the Map interface. This allows the execution time of basic operations, such as get( ) and put( ), to remain constant even for large sets… Continue reading >>