Do these figures still hold in the new Java versions? If not, then I would suggest adding the Java-version these performances were measured at.

This is a small cheat sheet and rules of thumb for using Java Collections Framework - nlharri/JavaCollectionsFrameworkCheatSheet

Want to perform one synchronization for a batch of ten writes? Also fine. It does require a little more care on your end, but it’s likely what you want. Also note that if you have an ArrayList, you can use the Collections.synchronizedList function to create a synchronized list, thus getting you the equivalent of a Vector.

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extreme to notice a performance impact · O(n) - linear to your collection size: the larger your · collection is, the slower your operations will be · ArrayList · O(1) O(n) O(n) HashSet · O(1) O(1) O(1) HashMap · O(1) O(1) O(1) TreeMap · O(log(n)) O(log(n)) O(log(n)) Java Collections Cheat Sheet ·

Want to perform one synchronization for a batch of ten writes? Also fine. It does require a little more care on your end, but it's likely what you want. Also note that if you have an ArrayList, you can use the Collections.synchronizedList function to create a synchronized list, thus getting you the equivalent of a Vector.

November 7, 2025 - A concise but comprehensive reference for Java Collections — including Collection, List, Set, Queue, Map, and the Collections utility class.

March 6, 2025 - Below is the Java collections cheat sheet. You can use it as quick reference guide to prepare for the interviews. ... Java Collection Framework is a framework which provides some predefined classes and interfaces to store and manipulate the group of objects. Using Java collection framework, you can store the objects as a List or as a Set or as a Queue or as a Map and perform ...

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February 9, 2025 - Primitive support Order of iteration FIFO Sorted Performant ‘contains’ check LIFO Random access By key * IntArrayList (Fastutil) PriorityQueue PriorityBlockingQueue ArrayDeque ArrayBlockingQueue ** ** * O(log(n)) complexity, while all others are O(1) - constant time ** ** when using Queue interface methods: offer() / poll() How fast are your collections? need: primitive type collections, multimaps, https://github.com/JCTools/JCTools Duplicate element support Int2IntMap (Fastutil) includes almost any collection you might JCTools Key-value pairs * Previously known as gs-collections, this library bidirectional maps and so on.

April 20, 2016 - Our Java collections cheat sheet looks at Java collections for list, set, map, queue, utilities, and more. Plus, download our Java cheat sheet pdf!

This is a small cheat sheet and rules of thumb for using Java Collections Framework - JavaCollectionsFrameworkCheatSheet/README.md at master · nlharri/JavaCollectionsFrameworkCheatSheet

August 8, 2023 - Java Collections Cheat Sheet · Notable Java collections · libraries · Fastutil · http://fastutil.di.unimi.it/ Fast & compact type-specific collections for Java · Great default choice for collections of primitive · types, like int or long. Also handles big · collections with more than 231 elements well. Guava · https://github.com/google/guava ·

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December 7, 2024 - This post gives you a quick and good reference/recap of complete Java Collections, in about 15 minutes. Java Collections are used to store and manipulate multiple data items during Application run time.

April 30, 2025 - To aid in quick decision-making, here’s a cheat sheet summarizing the performance of Java collections:

July 17, 2023 - // Basic initialization Queue<Integer> pQueue = new PriorityQueu<>() // By default ASC // DSC PriorityQueue<Integer> pQueue = new PriorityQueue<Integer>(Collections.reverseOrder()); PriorityQueue<Integer> pQueue = new PriorityQueue<Integer>((a, b) -> b - a); pQueue.isEmpty() // returns true/false pQueue.peek() // returns the first element of the queue and don't remove // Add item pQueue.offer(10); // add end of the priority queue.

Java Collections Cheat Sheet · Notable Java collections · libraries · Fastutil · http://fastutil.di.unimi.it/ Fast & compact type-specific collections for Java · Great default choice for collections of primitive · types, like int or long. Also handles big · collections with more than 231 elements well. Guava · https://github.com/google/guava ·

January 29, 2025 - Primitive support Order of iteration FIFO Sorted Performant ‘contains’ check LIFO Random access By key * IntArrayList (Fastutil) PriorityQueue PriorityBlockingQueue ArrayDeque ArrayBlockingQueue ** ** * O(log(n)) complexity, while all others are O(1) - constant time ** ** when using Queue interface methods: offer() / poll() How fast are your collections? need: primitive type collections, multimaps, https://github.com/JCTools/JCTools Duplicate element support Int2IntMap (Fastutil) includes almost any collection you might JCTools Key-value pairs * Previously known as gs-collections, this library bidirectional maps and so on.

April 14, 2025 - Here’s a quick reference cheat sheet that can help you identify the right collection for your needs: Use Collections.sort(list) with custom Comparator. Convert between collections using constructors (e.g., new ArrayList<>(set)). Use enhanced for-loops or streams for iteration.