Difference between set and list
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Set interface is implemented by HashSet, LinkedHashSet, EnumSet, TreeSet, CopyOnWriteArraySet. A List extends Collection similar to how a Set did, but it maintains the order of insertion.
List is an Ordered Collection while Set is an unordered Collection. Lists were introduced in Excel 2003. The elements of a set is not hashable.
It can have any number of null values. In the context of mathematics, the items of a set are unique and unordered. A set only has a key, with nothing else attached to it. Instead, it restricts the add and addall methods of collection to add any duplicate object in a collection. A vector uses the List interface and therefore it maintains the order of insertion. They use different implementations based on performance and other characteristics e. Lists must be ordered, and are therefore accessible by index. About the Author Gina Poirier has a professional background in nonprofit administration and management, primarily with youth development organizations. What is difference between List and Set in Java is a very and an important fundamental concept to remember while using Collections class in Java. Pluralsight offers a 10-day free trial period, in which you can access many more advanced Java courses. Distinct means there are no duplicates and a collection means there is no order for individual elements.
java - Set: A Set cannot have Duplicate elements in its collections. List does not define any method to operate on the range of indexes in a list.
What is difference between List and Set in Java is a very and an important fundamental concept to remember while using Collections class in Java. Both List and Set are two of most important Collection classes Java Program use along with various Map implementation. Basic feature of List and Set are abstracted in List and Set interface in Java and then various implementation of List and Set adds specific feature on top of that e. In this Java tutorial we will see some fundamental difference between List and Set collections. Since List and Set are generified with introduction of these difference also application to List and Set. List is an Ordered Collection while Set is an unordered Collection. difference between set and list List maintains insertion order of elements, means any element which is inserted before will go on lower index than any element which is inserted after. Set in Java doesn't maintain any order. Though Set provide another alternative called SortedSet which can store Set elements in specific Sorting order defined by methods of Objects stored in Set. These difference between Set and List also teaches us when to use Set and when to prefer List. On the other hand if your requirement is to maintain unique collection without any duplicates than Set is the way to go. What if I need an ordered collection with unique elements. Thanks for you great blog, btw. Linkedhashset to maintain insertion order like list said. I was asked this question in my last interview. They also asked my for the difference between an ArrayList and Vector. Unknow indeed this is very popular interview questions on Java collection framework. Anonymous If you need ordered collection with unique elements than consider using LinkedHashSet which is not a List but a Set implementation with combination of hashtable and LinkedList and maintains insertion order or elements order difference between set and list which elements are inserted into Set just like List interface. Another important difference to note is the complexity of insertion. List is repetitive collection, so if you gotta insert, just insert at a particular node. But set on the other hand is unique and hence it has to validate before insertion. So this makes the Set bit slower than the list said. What does ConcurrentSkipList do, does it also implement List interface?.
