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.
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.
Baeldung
baeldung.com › home › java › java collections › set vs list in java
Set vs List in Java | Baeldung
April 3, 2025 - Also, we’ll compare the two data structures in terms of performance and memory allocation. Both List and Set are members of Java Collections.
java - What is the difference between Set and List? - Stack Overflow
More formally, sets contain no ... and at most one null element. As implied by its name, this interface models the mathematical set abstraction. ... For a SortedSet, there are no two elements where compareTo() == 0, as equals is not called. 2009-06-25T17:52:55.69Z+00:00 ... A Set CAN be ordered, so the first statement of this answer is misleading, even if of course a List must be choosen to enforce the Collection order 2013-03-06T11:00:43.377Z+00:00 ... WRONG! A Java set can be ... 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, 2022Converting a set to list
Despite your "efforts" (lizst, lst), you still have a list variable in scope somewhere, shadowing the function. If you're still in that iPython session, del list will remove it and give you the builtin back. More on reddit.com
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July 17, 2017[Java] Need to add a Set<Character> to List<String>
It's easy if you put a little effort into looking: https://www.google.com/search?q=java+convert+char+to+string More on reddit.com
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October 12, 201604:03
List vs Set in Java Collections | Last-Minute Java Interview Guide ...
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Java Tutorial For Beginners #12 - Sets and Lists - YouTube
38:35
Difference between Set and List in Java Collections by Deepak - ...
16:41
Java Collections: List, Set, Map, Stack and Queue explained - YouTube
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Difference between List and Set in Java | Java Interview - YouTube
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Java Set vs List - YouTube
Scaler
scaler.com › home › topics › difference between list and set in java
Difference Between List and Set in Java - Scaler Topics
April 25, 2024 - A List interface is an ordered collection of values in which values may or may not be duplicated · In Java, a set is a collection that does not allow duplicate elements and has no guaranteed order for its elements.
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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 |
Blogger
javarevisited.blogspot.com › 2012 › 04 › difference-between-list-and-set-in-java.html
Difference between List and Set in Java Collection? Example
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 Comparable and Comparator methods of Objects stored in Set.
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.
Medium
medium.com › the-60-second-programmer › working-with-collections-in-java-list-set-and-map-️-0a581c06978c
Working with Collections in Java: List, Set, and Map 🗂️ | by Marcelo Domingues | The 60-Second Programmer | Medium
September 15, 2024 - Understanding when to use List, Set, or Map is key to writing efficient Java programs. Use a List for ordered data with duplicates, a Set for unique elements, and a Map for key-value pairs.
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.
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)?
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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.
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 two main interfaces provided by the Collection framework in Java for storing and manipulating groups of objects. Lists are suitable for ordered collections that allow duplicates, while Sets are suitable for unordered ...
Baeldung
baeldung.com › home › java › java collections › converting between a list and a set in java
Converting between a List and a Set in Java | Baeldung
April 4, 2025 - It’s worth mentioning that addAll() is a method from the Collection interface. Therefore, it can also be used to convert a List to a Set. We’ll see an example later. Stream API was introduced in Java 8. It provides many handy methods that allow us to deal with collections easily.
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 - This is one of the frequently asked questions in Java interviews for beginners. The List interface maintains the insertion order, i.e., while displaying the elements, it will maintain the order in which they were inserted. The Set interface does not maintain any order. Elements are returned in no particular order. Here is an example of a List and Set with output demonstrating the ordering:
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 ...
Vibrantpublishers
vibrantpublishers.com › blogs › blogs-on-programming › java-collections-list-set-queue-map
Java Collections – List, Set, Queue & Map
April 3, 2020 - Here you will begin at one end ... in a list, you can do the following: Java Set is a collection construct that, by definition, contains unique elements — that is, no duplicates....
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.
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
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).
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.
GeeksforGeeks
geeksforgeeks.org › java › list-set-java
List to Set in Java - GeeksforGeeks
December 26, 2025 - In Java, converting a List to a Set is commonly done to remove duplicate elements, since a Set does not allow duplicates. This can be achieved using simple iteration, collection constructors, the addAll() method, or the Java 8 Stream API. Different Set implementations such as HashSet and TreeSet also determine whether the elements remain unordered or sorted.
Learneroo
learneroo.com › modules › 83 › nodes › 438
Lists and Sets - Learneroo
A list has a definite order, but is not necessarily sorted into ascending order. A set is a collection that has no duplicate entries. The elements of a set might or might not be arranged into some definite order. While ArrayList was covered in the ArrayList Notebook and ArrayList Reference, this page discussed it in the context of Java Collections.