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 - Both List and Set are members of Java Collections.
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.
java - What is the difference between Set and List? - Stack Overflow
One thing to note: positional access ... array vs linked list stackoverflow.com/questions/322715/… 2015-11-30T16:35:01.637Z+00:00 ... How are Sets indexed if not by positional access? (+1 for the ASCII-table) 2018-09-13T17:56:04.593Z+00:00 ... I don't like to read. This makes it very concise and simple. 2022-02-02T14:51:16.77Z+00:00 ... Ordered lists of element (unique or not) Conform to Java's interface ... More on stackoverflow.com
When to use Sets vs Lists .
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. More on reddit.com
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July 31, 2022Help with setting up vscode for java on wsl
i tried to setup java on vscode, but i ended up using intellij. More on reddit.com
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May 3, 2020Setting JAVA_HOME path
It means that you have not configured the JAVA_HOME environment variable. Using a virtual terminal application, type in: update-alternatives --config java, which will give you the location of JDK listed under Path column. Depending on the installed version of JDK, it will be something like: /usr/lib/jvm/java-14-openjdk-amd64/bin/java If you have installed multiple versions of JDK, all of them will be listed here 2. Using text editor such as nano and terminal emulator, type in: nano /etc/profile.d/jdk_home.sh This will create and open for editing a new script file named jdk_home.sh under the location /etc/profile.d, where you need to type in: export JAVA_HOME= where JDK-Location should not include the /bin/java directories. For example: EXPORT JAVA_HOME=”/usr/lib/jvm/java-14-openjdk-amd64” This will set your environment variable JAVA_HOME The steps above are if you have installed JDK using apt package manager tool, you also have the option of using SDKMAN which will configure all environment variables for you automatically. More on reddit.com
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February 27, 202000:21
Set vs List: Order, Duplicates, and Performance Explained #shorts ...
02:32
Set vs List in Java: Key Differences Explained! - YouTube
04:03
List vs Set in Java Collections | Last-Minute Java Interview Guide ...
20:43
Set and HashSet in Java - Full Tutorial - YouTube
18:00
Sets, HashSet, TreeSet, LinkedHashSet - Full Tutorial - Java Data ...
11:54
#92 ArrayList in Java - 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
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.
2 of 16
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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.
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.
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).
Blogger
javarevisited.blogspot.com › 2012 › 04 › difference-between-list-and-set-in-java.html
Difference between List and Set in Java Collection? Example
Remember that both of them are ... over collection. 1) Fundamental difference between List and Set in Java is allowing duplicate elements....
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 ...
Net Informations
net-informations.com › java › cjava › list.htm
What is the difference between List and Set in Java
Lists are used when the order of elements matters, and duplicates are allowed. Set: A Set is an unordered collection that does not allow duplicate elements. It does not maintain any specific order of elements. Sets are used when uniqueness of elements is important, and the order is not relevant.
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....
Java67
java67.com › 2012 › 08 › difference-between-list-and-set-in-java.html
Difference between List and Set in Java [Answered] | Java67
Learn Java and Programming through articles, code examples, and tutorials for developers of all levels. ... The main difference between List and Set is that List is an ordered Collection while Set is an unordered collection.
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.
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.
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 ...
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.
Pediaa
pediaa.com › home › technology › it › programming › what is the difference between list and set
What is the Difference Between List and Set - Pediaa.Com
April 5, 2019 - The main difference between List and Set is that List store duplicate values while Set does not store duplicate values. In other words, List can have the same element multiple times while a set contains only the unique 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
Medium
medium.com › @cleitonestefenon › key-differences-between-list-set-and-map-in-the-java-collections-framework-a2d765e316ac
Key Differences Between List, Set, and Map in the Java Collections Framework | by Cleiton Estefenon | Medium
December 10, 2024 - Use List when order matters and duplicates are allowed. Use Set when you need uniqueness and order isn’t critical. Use Map to store key-value associations for efficient lookups. Looking to master Java? Try combining these collections in more complex scenarios!
DEV Community
dev.to › paulike › comparing-the-performance-of-sets-and-lists-3di7
Comparing the Performance of Sets and Lists - DEV Community
July 13, 2024 - Sets are more efficient than lists for storing nonduplicate elements. Lists are useful for accessing elements through the index. The elements in a list can be accessed through the index.