List is an ordered sequence of elements whereas Set is a distinct list of elements which is unordered (thank you, Quinn Taylor).
List<E>:
An ordered collection (also known as a sequence). The user of this interface has precise control over where in the list each element is inserted. The user can access elements by their integer index (position in the list), and search for elements in the list.
Set<E>:
Answer from Andrew Hare on Stack OverflowA collection that contains no duplicate elements. More formally, sets contain no pair of elements e1 and e2 such that e1.equals(e2), and at most one null element. As implied by its name, this interface models the mathematical set abstraction.
Baeldung
baeldung.com › home › java › java collections › set vs list in java
Set vs List in Java | Baeldung
April 3, 2025 - Since a Set is not guaranteed to maintain order, it can’t be indexed. Let’s compare the performance of the List and Set data structures using the Java Microbench Harness (JMH). First, we’ll create two classes: ListAndSetAddBenchmark and ListAndSetContainBenchmark.
Scaler
scaler.com › home › topics › difference between list and set in java
Difference Between List and Set in Java - Scaler Topics
April 25, 2024 - In Java, a set is a collection that does not allow duplicate elements and has no guaranteed order for its elements. In Java, when comparing “list vs set” a list supports ordered collections and allows duplicates, whereas a set emphasizes uniqueness without any specific order.
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List vs Set vs Map 🔥 Java Interview TRAP (Most Asked Question) ...
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Set vs List in Java: Key Differences Explained! - YouTube
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Java Set vs List
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Java Tutorial For Beginners #12 - Sets and Lists - YouTube
Reddit
reddit.com › r/javahelp › when to use sets vs lists .
r/javahelp on Reddit: When to use Sets vs Lists .
July 31, 2022 -
I acknowledge the difference between them on a basic level, like how sets don't allow duplicates and aren't in order, whereas lists have an order and allow duplicates, but from a performance standpoint, what are they better at doing? For example, if I have a group of integers that I want to store in no particular order, and contain no duplicates, will it always be better to store them in a set rathern than a list (with the exception of maybe a few very special cases)?
Top answer 1 of 5
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It's generally not useful to think about data structures without knowing what queries you're going to perform on them. In general, if you need to look up if the collection contains the element, use a Set. Otherwise a List will be faster for about every other operation.
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from a performance standpoint, what are they better at doing What performance goals do you need to meet, or what performance problem do you need to avoid? If you don't know the answer to those questions then you're looking to avoid some performance problem without knowing what problem you're trying to avoid. Choose which Collection type meets your functional needs, not whether it is fast that another based on a potential problem you don't know you have.
Are sets used as often as maps and lists in real programming? Mar 27, 2022
r/ProgrammingLanguages 4y ago
GeeksforGeeks
geeksforgeeks.org › java › difference-between-list-and-set-in-java
Difference Between List and Set in Java - GeeksforGeeks
June 4, 2026 - List allows duplicate elements and maintains insertion order. Set does not allow duplicate elements and ensures unique values only. Both are interfaces in java.util and are implemented by different collection classes like ArrayList, LinkedHashSet, etc.
Top answer 1 of 16
574
List is an ordered sequence of elements whereas Set is a distinct list of elements which is unordered (thank you, Quinn Taylor).
List<E>:
An ordered collection (also known as a sequence). The user of this interface has precise control over where in the list each element is inserted. The user can access elements by their integer index (position in the list), and search for elements in the list.
Set<E>:
A collection that contains no duplicate elements. More formally, sets contain no pair of elements e1 and e2 such that e1.equals(e2), and at most one null element. As implied by its name, this interface models the mathematical set abstraction.
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| List | Set | |
|---|---|---|
| Duplicates | Yes | No |
| Order | Ordered | Depends on implementation |
| Position Access | Yes | No |
Board Infinity
boardinfinity.com › blog › list-and-set
List vs Set: Key Differences | Board Infinity
August 30, 2025 - However, the key distinction between both is that a List is a collection of ordered elements, and that the elements are added, removed, or accessed with the use of an index variable.
Medium
medium.com › spring-boot › comparing-sets-and-lists-and-when-to-use-them-b0cf5f042592
Comparing sets and lists and when to use them | by Piyu Jain | JavaToDev | Medium
June 3, 2023 - In summary, Lists and Sets are ... groups of objects. Lists are suitable for ordered collections that allow duplicates, while Sets are suitable for unordered collections of unique elements....
TutorialsPoint
tutorialspoint.com › difference-between-list-and-set-in-java
Difference between List and Set in Java
March 27, 2025 - In Java, List and Set are both interfaces that belong to the Collection framework. Both interfaces extend the Collection interface. They are both used to store a collection of objects as a single unit.
Blogger
javarevisited.blogspot.com › 2012 › 04 › difference-between-list-and-set-in-java.html
Difference between List and Set in Java Collection? Example
Here are few noteworthy differences between List and Set in Java. Remember that both of them are used to store objects and provides a convenient API to insert, remove and retrieve elements, along with to support Iteration over collection.
DEV Community
dev.to › abhishek_kumar_d9009a7ae6 › differences-between-set-and-list-in-java-48ae
Differences between Set and List in Java - DEV Community
October 3, 2024 - List: Allows duplicates, maintains insertion order, and provides random access via index. Ideal for ordered data and when duplicates are needed. Set: No duplicates, no guaranteed order (unless using LinkedHashSet or TreeSet).
Net Informations
net-informations.com › java › cjava › list.htm
What is the difference between List and Set in Java
List: Lists allow duplicate elements. You can have multiple elements with the same value in a List. Set: Sets do not allow duplicate elements.
Java67
java67.com › 2012 › 08 › difference-between-list-and-set-in-java.html
Difference between List and Set in Java [Answered] | Java67
The main difference between List and Set is that List is an ordered Collection while Set is an unordered collection. Java collection framework offers several collection classes for various needs but all collections can be divided into broadly ...
Medium
naveen-metta.medium.com › understanding-set-vs-list-in-java-9958f2416e31
Understanding Set vs. List in Java | by Naveen Metta | Medium
April 16, 2024 - In this article, we’ll delve into the differences between Set and List, explore their implementations, and provide comprehensive code examples to illustrate their usage. A Set is a collection that does not allow duplicate elements. It models the mathematical set abstraction and provides operations such as union, intersection, and difference. In Java, the Set interface is implemented by classes like HashSet, TreeSet, and LinkedHashSet.
Quora
quora.com › When-should-I-use-Lists-vs-Sets-in-Java
When should I use Lists vs Sets in Java? - Quora
Answer (1 of 7): The simplistic answer is: use lists when order is important; use sets when all you’re interested in is membership. TreeSets are an exception to this — they are sets, but kept sorted according to some comparison operation on the members. Other languages may call these “ordered ...
YouTube
youtube.com › watch
Difference between List and Set in Java | Java Interview - YouTube
In this video, we will discuss the difference between List and Set with an example.This is one of the frequently asked interview question for beginners in ja...
Published: August 19, 2020
BeginnersBook
beginnersbook.com › 2014 › 07 › difference-between-list-and-set-in-java
Difference between List and Set in Java
September 11, 2022 - If the requirement is to have only unique values then Set is your best bet as any implementation of Set maintains unique values only. If there is a need to maintain the insertion order irrespective of the duplicity then List is a best option. Both the implementations of List interface – ArrayList ...
Java Guides
javaguides.net › 2023 › 07 › difference-between-list-and-set-in-java.html
List vs Set: Difference Between List and Set in Java
January 24, 2024 - The List allows duplicate elements. The same element can be inserted multiple times in different positions. Sets don’t allow duplicate elements.
Naukri
naukri.com › code360 › library › difference-between-list-and-set-in-java
Difference between List and Set in Java
September 23, 2025 - Almost there... just a few more seconds
GeeksforGeeks
geeksforgeeks.org › java › difference-between-list-set-and-map-in-java
Difference between List, Set and Map in Java - GeeksforGeeks
June 6, 2026 - List stores elements in an ordered sequence and allows duplicate values. Set stores only unique elements and does not allow duplicates. Map stores data in the form of key-value pairs, where each key must be unique.
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List is an ordered sequence of elements. User can easily access element present at specific index and can insert element easily at specified index.Set is an unordered list of elements. Set does not have duplicate elements. If you need to know everything about Java and become a good Java programmer, it is suggested to join comprehensive Java certification course now.
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LISTSETDuplicatesYESNOOrderOrderedDepends on ImplementationPositional AccessYESNOList is an ordered sequence of elements whereas Set is a distinct list of elements which is unordered.List : An ordered collection (also known as a sequence). The user of this interface has precise control over where in the list each element is inserted. The user can access elements by their integer index (position in the list), and search for elements in the list.Set: A collection that contains no duplicate elements. More formally, sets contain no pair of elements e1 and e2 such that e1.equals(e2), and at most one null element. As implied by its name, this interface models the mathematical set abstraction.