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Collections in Java are a framework that provides an architecture to store and manipulate groups of objects. The Java Collection Framework includes various interfaces and classes that allow developers to perform operations such as searching, sorting, insertion, manipulation, and deletion on data.
Key Interfaces and Classes
Collection Interface
The Collection interface is the root interface for most of the collection classes. It defines several methods that all collections must implement, such as add(), remove(), size(), clear(), contains(), and iterator()12.
List Interface
The List interface extends the Collection interface and represents an ordered collection of elements. It allows duplicate values and provides methods to access elements by their index. Common implementations include ArrayList, LinkedList, Vector, and Stack12.
Set Interface
Collections in Java - GeeksforGeeks
Mar 21, 2025 · Java Collections are a framework introduced in JDK 1.2 that provides a unified architecture for storing and manipulating groups of objects, featuring interfaces like Collection …
See results only from geeksforgeeks.orgList Interface
The Java List Interface, part of the java.util package, allows for the storage of …
ArrayList
Java ArrayList is a part of the collections framework and it is a class of java.util …
Vector Class
The Vector class implements a growable array of objects. Vectors fall in legacy …
LinkedList
Linked List is a part of the Collection framework present in java.util …
HashSet
Hierarchy of HashSet. Declaring a HashSet public class HashSet<E> extends …
Set
The Set Interface in Java, part of the java.util package, is an unordered …
Map Interface
Dictionary class in Java is an abstract class that represents a collection of key-value …
Abstract List Class
The AbstractList class in Java is a part of the Java Collection Framework and …
Queue Interface
Creating Queue Objects . Since Queue is an interface, objects cannot be created …
TreeSet
2. TreeSet(Comparator): This constructor is used to build an empty TreeSet object in …
Java Collections Cheat Sheet
Java Language Tutorial => Java Collections Flowchart
Use the following flowchart to choose the right Collection for the job. This flowchart was based off [http://i.stack.imgur.com/aSDsG.png).
Java Collections Cheat Sheet - Medium
Sep 24, 2017 · This Flow diagram will help you choose your Collection Class effectively based on your needs :-
Java Collections Flowchart - Google Drawings
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