When to use the Collection Classes(HashSet, LinkedHashSet,
TreeSet....etc) in real time scenario ?
Answer Posted / manja
LinkedHashSet, TreeSet and HashSet are three of most popular implementation of Set interface in Java Collection Framework. Since they implement Set interface, they follow it's contract for not allowing duplicates. All these implementation except, TreeSet uses equals() method to check for duplicates, on the other hand TreeSet use compareTo() or compare() method for comparing objects and can break Set interface contract of unique element, if equals method is not consistent with compareTo() or compare() method. In this Java Collection tutorial, we will see difference between LinkedHashSet vs TreeSet vs HashSet on different points e.g. speed, performance, ordering, synchronization etc. Based upon these differences we can also decide when to use LinkedHashSet vs TreeSet vs HashSet in Java. TL;DR, Use HashSet for all general purpose usage i.e. where you need to store only unique elements without any ordering requirement. If you need to maintain order on which elements are added into Set then use LinkedHashSet, it provides ordering with little impact on performance. Use TreeSet when you absolutely nee to keep elements in specific sorted order e.g. keeping employee in increasing order of their age or salary. Remember, TreeSet is significantly slower than LinkedHashSet and HashSet because of this sorting overhead.
Is This Answer Correct ? | 6 Yes | 0 No |
Post New Answer View All Answers
What are the main classes of the list interfaces? : java collections
What are the uses of the set interfaces in the java collections? : java collections
what is mean by hasing and maping in java platform and advantage?
What are the queues in the java collection framework? : java collections
What is an algorithm in java collection framework? : java collections
What are the types of the main implementing classes in the map interfaces? : java collections
Which sorting algorithm is used by collections.sort() in java ?
What is the enumerator of the java collection framework? : java collections
What are the different types of features of the java collections framework? : java collections
What is deque in the java collections framework? : java collections
In hyderabad, which s/w training center is best for java, other than corejava what r the new tools to learn in java,which tool is best & have current requirement,pls give me information about java to learn ?
What are the different types of collections views being provided by the map interface? : java collections
How do I find jre path in windows?
What are the considerations to be made in case of loops in java ?
What do you understand by synchronization? Why is it important?