Interested to Buy Any Domain ? << Click Here >> for more details...
When to use the Collection Classes(HashSet, LinkedHashSet,
TreeSet....etc) in real time scenario ?
- 1 Answers
- 9944 Views
- Cap Gemini, I also Faced
- E-Mail Answers
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 queues in the java collection 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 classes implemented in the set interfaces? : java collections
What is an algorithm in java collection framework? : java collections
Which server-side script takes the input from JavaScript, can access the database if it needs to, and processes the data.
What are the classes in the java collection framework? : java collections
Which java collection class can be used to maintain the entries in the order in which they were last accessed?
HOW MUCH PERCENTAGE WE DEDUCT FOR OUR SUPPLIERS OR OTHER PROFESSIONALS
can u draw class/object diagram for ATM
What is the enumerator of the java collection framework? : java collections
What is the difference between comparable and comparator in java.util pkg?
How do I find jre path in windows?
my interviewer asked me what technical specification you used how to answer that question
Which sorting algorithm is used by collections.sort() in java ?
What are the uses of the set interfaces in the java collections? : java collections
