Jan 8, 2024 · Instead of explaining all types of collections in a single article, we’ll explain three of the most common ones: ArrayList, LinkedList, and HashMap. In this tutorial, we’ll look at how they store data, their performance, and recommend when to use them.

ArrayList and LinkedList are two most popular used List implementation while LinkedHashSet, TreeSet and HashSet are frequently used Set implementation. In this Java article we will see difference between Map, Set and List in Java and learn when to use List, Set or Map.

Mar 30, 2024 · HashMap stores key-value pairs and offers constant-time complexity for basic operations like put, get, and remove. It uses hashing to map keys to indices in an array, providing efficient...

Nov 2, 2011 · ArrayList and LinkedList are an implementation of the List interface. LinkedList provides sequential access and is generally more efficient at inserting and deleting elements in the list, however, it is it less efficient at accessing elements in a list.

Jun 18, 2017 · HashMap maps a value to a key, and the keys are stored in a set (so it can be in the set only once). HashMap doesn't preserve insertion order for the key set, while LinkedHashMap does retain insertion order for the keys.

Jan 20, 2022 · ArrayList allows null Values and HashMap allows null key and values. Both ArrayList and HashMap can be traversed through Iterator in Java.

This tutorial provides an in-depth comparison of three essential collection classes: ArrayList, LinkedList, and HashMap. Understanding their differences, benefits, and optimal use cases can significantly enhance your programming skills and application performance.

Feb 19, 2024 · LinkedList: An implementation of the List and Deque interfaces, LinkedList uses a doubly linked list to store its elements. This structure allows for efficient insertion and removal of elements...

Aug 24, 2023 · In Java, an Array is a fixed-sized, homogenous data structure that stores elements of the same type whereas, ArrayList is a dynamic-size, part of the Java Collections Framework and is used for storing objects with built-in methods for manipulation.

Jun 5, 2024 · For most scenarios, ArrayList, HashMap, and HashSet provide efficient solutions covering a wide range of use cases. However, if you need specific ordering guarantees, sorted elements, or specialized behavior, other implementations such as LinkedList, LinkedHashMap, and TreeMap may be more suitable.