Home>Courses>Collections in Java

Collections in Java

Gain insights into Java Collections Framework. Delve into lists, sets, and hashmaps. Learn about data modification, sorting, thread-safety, and internal workings for efficient usage.

Intermediate

57 Lessons

Certificate of Completion

Gain insights into Java Collections Framework. Delve into lists, sets, and hashmaps. Learn about data modification, sorting, thread-safety, and internal workings for efficient usage.

AI-POWERED

Explanations

AI-POWERED

Explanations

This course includes

106 Playgrounds

5 Quizzes

Course Overview

Course Content

Apply Your Skills

Recommendations

Course Overview

Collection is one of the most important topics for Java programming. Without the proper knowledge of every collection type in Java, it becomes difficult for you to decide which option to pick in a particular scenario. This course will give you a great understanding of all collection types available in the Collections Framework like lists, linked lists, sets, and hashmaps. After completing this course, you will know how data can be modified within a collection, how to sort a collection, and how it can be ...Show More

Course Content

Let's Begin

2 Lessons

Get familiar with Java collections, their types, functions, and usage for better coding.

Course Introduction

Introduction to Collections

Lists in Java

11 Lessons

Get started with managing, iterating, and sorting ArrayLists, and applying basic operations.

ArrayList: Introduction

ArrayList: Inserting and Retrieving Elements

ArrayList: Operations

ArrayList: Iteration

ArrayList: Iteration using ListIterator

ArrayList Sorting

Understanding Comparable Interface

Understanding Comparator Interface

ArrayList: Exercise

ArrayList: Exercise Solution

Quiz: ArrayList

LinkedList in Java

2 Lessons

Examine Java's LinkedList structure, operations, methods for fetching, removing, and sorting elements.

LinkedList: Introduction

LinkedList: Fetching and Removing

CopyOnWriteArrayList in Java

3 Lessons

Enhance your skills in using CopyOnWriteArrayList for thread-safe Java collections.

CopyOnWriteArrayList: Introduction

CopyOnWriteArrayList: Internal Working

CopyOnWriteArrayList: Iteration

Sets in Java

6 Lessons

Solve problems in creating, managing, and iterating HashSet; identify duplicates efficiently.

HashSet: Creation and Insertion

HashSet: Operations

HashSet: Iteration and Sorting

HashSet: Exercise

HashSet: Exercise Solution

HashSet: Quiz

TreeSet in Java

4 Lessons

Follow the process of creating, managing, and solving problems using TreeSets in Java.

TreeSet: Creation and Insertion

TreeSet: Fetching and Removal

TreeSet: Exercise

TreeSet Exercise Solution

HashMap In Java

10 Lessons

Master the steps to create, update, and optimize HashMaps, including key design and iteration.

HashMap: Creation and Insertion

HashMap: Updation and Removal

HashMap: Operations

HashMap: Java 8 Improvements

HashMap: Internal Implementation

HashMap: How to Design a Good Key

HashMap: Iteration

HashMap: Exercise

HashMap: Exercise Solution

HashMap: Quiz

TreeMap in Java

4 Lessons

Step through creating, inserting, fetching, removing, and sorting elements in Java TreeMap.

TreeMap: Creation and Insertion

TreeMap: Fetching and Removal

TreeMap: Sorting a TreeMap by Values

TreeMap: HashMap Sorting

LinkedHashMap in Java

2 Lessons

Explore the structure and behavior of LinkedHashMap, maintaining insertion order in Java collections.

LinkedHashMap: Introduction

LinkedHashMap: Internal Working

10.

Additional Map Implementations

3 Lessons

Work your way through ConcurrentHashMap, IdentityHashMap, and EnumMap for efficient and specialized Map usage.

ConcurrentHashMap

IdentityHashMap

EnumMap

11.

Arrays Class

5 Lessons

Grasp the fundamentals of Java's Arrays class, including searching, sorting, copying, and performing operations.

12.

Collections Class

5 Lessons

Make Java collections efficient and secure with min, max, and thread-safe methods.

Finding the Min and Max element

Searching, Filing, and Copying Collection

Making Collections Unmodifiable

Making Collections thread-safe

Thank You!

Course Author

Saurav Aggarwal

Trusted by 2.5 million developers working at companies

"These are high-quality courses. Trust me. I own around 10 and the price is worth it for the content quality. EducativeInc came at the right time in my career. I'm understanding topics better than with any book or online video tutorial I've done. Truly made for developers. Thanks"

Anthony Walker

@_webarchitect_

"Just finished my first full #ML course: Machine learning for Software Engineers from Educative, Inc. ... Highly recommend!"

Evan Dunbar

ML Engineer

"You guys are the gold standard of crash-courses... Narrow enough that it doesn't need years of study or a full blown book to get the gist, but broad enough that an afternoon of Googling doesn't cut it."

Carlos Matias La Borde

Software Developer

"I spend my days and nights on Educative. It is indispensable. It is such a unique and reader-friendly site"

Souvik Kundu

Front-end Developer

"Your courses are simply awesome, the depth they go into and the breadth of coverage is so good that I don't have to refer to 10 different websites looking for interview topics and content."

Vinay Krishnaiah

Software Developer

"I've tried probably 5-7 different sites and Educative is easily the best. It perfectly blends explanation with interactivity"

Eric Downs

Musician/Entrepeneur

Hands-on Learning Powered by AI

See how Educative uses AI to make your learning more immersive than ever before.

Instant Code Feedback

Evaluate and debug your code with the click of a button. Get real-time feedback on test cases, including time and space complexity of your solutions.

AI-Powered Mock Interviews

Put your skills to the test in a simulated interview setting. Receive personalized feedback based on your performance. Available in Premium & Premium Plus plans.

Adaptive Learning

At various checkpoints throughout Educative courses, you will be prompted to take a quick assessment. Receive a condensed curriculum tailored to your strengths and skill gaps.

Explain with AI

Select any text within any Educative course, and get an instant explanation — without ever leaving your browser.

AI Code Mentor

AI Code Mentor helps you quickly identify errors in your code, learn from your mistakes, and nudge you in the right direction — just like a 1:1 tutor!

Recommended before starting this course

Course

Learn REST and SOAP API Test Automation in Java

intermediate

3 hours

Course

Java Unit Testing with JUnit 5

intermediate

5 hours

Course

Design a Test Automation Framework with Selenium and Java

beginner