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Hashmap Library In Java
The hashmap class of java is almost the same as hashtable, except that it is unsynchronized and permits nulls. For example, if you need to add an element to the hashmap, use the put () method. It stores the data in the pair of key and value.
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It was introduced in the java 1.2 version and hence has been a part of the java collection library. Extends v > m) constructs a new hashmap with the same mappings as the specified map. Because hashcode for null is always 0.
It uses a technique called hashing.
Here i am trying to implement hashmap with arraylist. Gson library is one of the most used libraries for converting a hashmap to a json object. A hashmap however, store items in key / value pairs, and you can access. In this reference page, you will find all the hashmap methods available in java.
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