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Java Collections Framework

Introduction

The Java Collections Framework (JCF) is a set of classes and interfaces that provide a powerful and flexible way to store and manipulate collections of objects.

Java Collections Framework

Table of Contents

  1. java
    1. ArrayList
    2. LinkedList
    3. Methods

Introduction

The Java Collections Framework (JCF) is a set of classes and interfaces that provide a powerful and flexible way to store and manipulate collections of objects.

java

The java package is the core of the JCF. It provides the foundation for all the other collection types.

ArrayList

An ArrayList is a resizable array that implements the List interface. It is a dynamic data structure that can grow or shrink as needed.

Do You Know?

ArrayList is backed by an array, so it provides fast random access to elements.

LinkedList

A LinkedList is a doubly linked list that implements the List interface. It is a dynamic data structure that allows for efficient insertion and deletion of elements at any position.

Avoid This

Random access in a LinkedList is slow, as you have to traverse the list from the beginning to reach a particular element.

Methods

The java package provides a rich set of methods for working with collections. Some of the most commonly used methods include:

  • add(): Adds an element to the collection.
  • remove(): Removes an element from the collection.
  • get(): Retrieves an element from the collection.
  • size(): Returns the number of elements in the collection.
  • isEmpty(): Checks if the collection is empty.
Important Note

The java package also provides methods for sorting, searching, and iterating over collections.

Summary

  • The java package provides the foundation for the JCF.
  • ArrayList is a resizable array that is efficient for random access.
  • LinkedList is a doubly linked list that is efficient for insertion and deletion.
  • The java package provides a rich set of methods for working with collections.

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