Java Collections

In this article, we will explore the world of Java Collections and learn how to use them effectively.

We will start with an introduction to Java Collections and the Collection Framework. Then, we will dive into the different types of collections available in Java, such as Lists, Sets, Maps, and Queues. Finally, we will see how to implement Java Collections in our code and understand the best practices for using them. This guide will provide a comprehensive understanding of Java Collections and help you implement them effectively in your projects.

Java Collections Framework

Java Collections is a framework that provides a way to store and manipulate a group of objects.

The Java Collections framework provides a comprehensive and flexible architecture that has various classes and interfaces that allow developers to work with various types of collections. From Lists and Sets to Maps and Queues, Java Collections provide a wide range of functionality to meet different use cases.
 

Different Types of Collections in Java

There are several types of collections in Java:

  • Lists: A list is an ordered collection of elements that allows duplicates. Examples of lists in Java include ArrayList and LinkedList.
  • Sets: A set is an unordered collection of unique elements. Examples of sets in Java include HashSet and TreeSet.
  • Maps: A map is a collection of key-value pairs. It provides a way to store elements where each element has a unique key. Examples of maps in Java include HashMap and TreeMap.
  • Queues: A queue is a collection that follows the First-In-First-Out (FIFO) principle. It allows elements to be added at one end and removed from the other. Examples of queues in Java include LinkedList and PriorityQueue.
  • Stack: A stack is a collection that follows the Last-In-First-Out (LIFO) principle. It allows elements to be added and removed only from the top of the stack. Examples of stacks in Java include LinkedList and ArrayDeque.

 

Lists

 

Sets