![]() “LinkedHashMap in Java – Javatpoint.”, Available here. “HashMap in Java – Javatpoint.”, Available here.Ģ. The main difference between HashMap and LinkedHashMap is that HashMap does not maintain the order of data insertion while LinkedHashMap maintains the order of data insertion. HashMap and LinkedHashMap are two implementations of Map interface. The LinkedHashMap is just like HashMap with an additional feature of maintaining an order of elements inserted into it.HashMap provided the advantage of quick insertion, search, and deletion but it never maintained the track and order of insertion which the LinkedHashMap provides where the elements can be accessed in their insertion order. In contrast, LinkedHashMap extends HashMap HashMap extends AbstratHashMap and AbstractHashMap implements Map interface. Moreover, HashMap extends the AbstractMap and AbstractMap implements the Map interface. Association with the Collection Interface Insertion Orderįurthermore, another difference between HashMap and LinkedHashMap is that HashMap does not maintain the order of data insertion while LinkedHashMap maintains the order of data insertion. Thus, this is the main difference between HashMap and LinkedHashMap. HashMap is a class that helps to create a collection which inherits the AbstractMap class and implements the Map interface while LinkedHashMap is a class that is an implementation of both Hashtable and Linked List of the Map interface with predictable iteration order. Difference Between HashMap and LinkedHashMap Definition That is because LinkedHashMap contains only unique keys. Moreover, there are two records with the same details, but it only prints one of them. LinkedHashMap prints the elements according to the inserted order. The getKey method displays the keys while the getValues method prints the values corresponding to those keys. The for loop with the Map.Entry help to iterate through all the items in ‘employees’. The put method allows inserting items to the LinkedHashMap. It can store multiple items with integer type key and String type value. In the above program, the ‘employees’ is an object of LinkedHashMap. ![]() An example program with HashMap is as follows. HashMap is not synchronized, and it does not maintain the data inserted order. It extends the AbstractMap and the AbstractMap implements the Map interface. ![]() HashMap is a class that implements the Map interface using a hash table. – Comparison of Key Differences Key Terms What is the Difference Between HashMap and LinkedHashMap On the other hand, LinkedHashMap maintains the order of data insertion. Two implementations of Map in Java Standard Edition are HashMap and LikedHashMap. The map is a commonly used data structure.
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