Dinesh has been a Spring enthusiast since 2008 and is a Pivotal Certified Spring Professional, an author of a book Spring 5 Design Pattern, and a blogger. It has a series of articles related to Java technologies. Hope this article is able to give much information about the internal working of LinkedHashMap in Java.ĭinesh Rajput is the chief editor of a website Dineshonjava, a technical blog dedicated to the Spring and Java technologies. If next of node is not null traverse to the second element and repeat the process 3 until a key is not found or next is not null.If next of node is null then return null.In our case, it is not found as the first element and next of node object is not null.If both are equals then return the value, otherwise, check for next element if it exists. Go to index 2 of an array and compare the first element’s key with given key.Calculate index by using a generated hash code, according to the index calculation formula, it will be 2.As we have implemented hashCode() method for the Key class, hash code will be generated as 4498. index = hashCode(key) & int hashCode(). Let’s see the following class of the Key implementations: package The singly linked list is palindrome without extra space Hashing ImplementationĪs we have discussed the Hashing implementation of the LinkedHashMap same as the HashMap hashing implementation, we have already discussed in this article. Remove Duplicates from the Unsorted Singly Linked list LinkedList Algorithms Interview Questionsįind the nth node from the end of a singly linked listĭelete given node from a singly linked list Let’s see the working of LinkedHashMap diagrammatically. Internally, the node of the LinkedHashMap represents as the below: LinkedHashMap is just an extension of HashMap as the class definition is as below public class LinkedHashMap The difference between LinkedHashMap and HashMap is the LinkedHashMap has retrieval order same as insertion order. That means LinkedHashMap has all functionality same as the HashMap either calculating index using Hashing for bucket finding. LinkedHashMap extends HashMap class and implements Map interface. That is why I have brought such questions in front of you. As we know that, a lot of interviewers ask internal working of data structures such HashMap, TreeMap, LinkedHashMap, LinkedListetc. In the previous article, we have discussed internal working about the HashMap and here we will discuss the internal working of LinkedHashMap in Java.
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