When to use the Collection Classes(HashSet, LinkedHashSet,
TreeSet....etc) in real time scenario ?
Answer / 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 |
What are the differences between the java collection and the java list? : java collections
What is Visual Source Safe(source control Tool)?
What is the servletcontext listener and what is JspContext and page context pls tell in simple words.
What causes Out of Memory exception?
What are the different types of classes implemented in the set interfaces? : java collections
what protocols does JNDI provide an interface to?
what is java virtual machine
2. Write a interface "Car" with the following methods void setName(String) String getName() void setColor(String) String getColor() void setModel(long) long getModel()
What is the use of log4j and how to make use of that in a application?
How is hashset maintained in memory by java ?
How do I find jre path in windows?
VSS Objectives