Sep 27, 2021 · Difference between List, Set, and Map in Java. Set does not allow duplicate elements. The list maintains insertion order. Set do not maintain any insertion order. The map also does not maintain any insertion order. We can add any number of null values. But in set almost only one null value.

Mar 28, 2012 · what is the difference among list, queue and set? In brief: A list is an ordered list of objects, where the same object may well appear more than once. For example: [1, 7, 1, 3, 1, 1, 1, 5]. It makes sense to talk about the "third element" in a list.

Explore the differences and use cases of List, Set, Queue, and Map in Java. Learn the best data structure for your needs with practical examples.

List vs. Set vs. Map. Duplicity: List allows duplicate elements. Any number of duplicate elements can be inserted into the list without affecting the same existing values and their indexes. Set doesn’t allow duplicates. All of the classes which implement the Set interface should have unique elements. Map stores the elements as key & value pairs.

Nov 4, 2021 · List; Set; Map; Queue; All of those interfaces extend from the main interface Collection, except the Map interface. Map is a different type, with its own purpose.

Here, you will learn the head-to-head comparisons between List, Set, and Map. The main differences between List, Set, and Map are as follows: The elements can be duplicated in the list interface. Duplicate elements are not permitted in a set. Duplicate elements are not allowed on the map. The list preserves the order of inclusion.

List vs Set vs Map in Java : A List represents an ordered or sequenced group of elements whereas a set represents a group of elements which can’t contain a duplicate element.

Apr 3, 2025 · To summarize, we use lists when the insertion order of elements matters and there are duplicate elements. Sets are used when elements are treated as a set of objects, there are no duplicates, and the insertion order doesn’t matter.

Learn the key differences between List, Set, and Map collections in Java, including their characteristics and use cases.

The Java language provides a set of collection frameworks that you can use to create and manage various types of object collections. This blog describes the most common collection classes and how to start using them. List: The list is an ordered collection, also known as …