Java Core

4.6179 hours9K learnersCertificate

Learn core Java concepts and standard tools that allow you to solve algorithmic problems or design math models. Choose this course to work with non-trivial and complex projects!

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JetBrains Academy

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What you'll learn

In this course, you will learn basic Java syntax (updated to Java 17) and get familiar with the most common data structures. This course won't overwhelm you with a detailed analysis of Java internals or backend technologies. Instead, as a general-purpose language, Java will lend you a helping hand in solving complex and interesting problems! While progressing through different projects of this course you will:

understand the syntax of Java and write readable and efficient code;
master various algorithms and structures;
learn how to work with data;
polish your knowledge of maths and learn more about linear algebra, numeral systems, and many more;
learn how to handle exceptions;
explore the build tools necessary for programming.

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Learn by doing

# 1

Apply knowledge into practice

You already know the theory. Now it's time to code like you do at work—in a professional IDE, with real project constraints, solving problems that actually matter. Welcome to software engineering as it should be.

# 2

Navigate complexity with surgical precision

Most developers waste months learning random concepts without seeing how they connect. Our interactive Knowledge Map fixes this. It shows exactly how every programming concept relates to others, helping you build a structured mental model of coding.

# 3

Copy the best. Then improve.

Here's what top engineers do that others don't: they study other people's code obsessively. When you get stuck on Hyperskill, you can explore solutions published by other developers. See their exact code. Understand their approach. Learn their tricks.

# 4

Code review that actually makes you better

We stripped code review down to what actually matters: does your solution work? Have you handled the edge cases? Is there a cleaner way to write this? Hyperskill acts like a competent reviewer who actually tests your code. Not genius-level analysis, not architecture debates — just solid feedback on making your code better.

Elevate your engineering mastery through real-world challenges

Master advanced engineering concepts through ambitious projects. Each project deepens your expertise and transforms you from an experienced engineer into an exceptional one.

Maze Runner (Java)

Mazes are amazing: keep running, find the exit if you can! If you are not too happy about getting stuck in the actual maze, you can entertain yourself with a virtual one. In this project, you will write a program that generates mazes and looks for a way out. You will practice concepts frequently tested in technical interviews at top tech companies.

Graduate

File Type Analyzer with Java

Files come in all possible formats: we usually see it specified in their names. Even if the file type was manual changed or even removed, information about the type is always contained within the file. And in this project, you will write a tool that will extract this info to determine the type of the file. You’ll try out different algorithms to solve this problem, and will see for yourself how using different algorithms will change the speed of the tool. You will practice concepts frequently tested in technical interviews at top tech companies.

Graduate

Blockchain with Java

Blockchains are data structures where blocks are inseparably connected. What makes blockchains so special is the security level they offer due to the way they are constructed. Blockchains are unhackable, so it makes perfect sense why cryptocurrency makes use of this technology. In this project, you will try yourself at making a microcosm where virtual miners earn cryptocurrency and exchange messages and transactions using blockchain. You will practice concepts frequently tested in technical interviews at top tech companies.

Graduate

Explore all projects

Topics covered by this course

Code organization

75 topics

Software development foundations

49 topics

Algorithms and Data Structures

44 topics

Working with data

39 topics

Basics

27 topics

Additional instruments

22 topics

Errorless code

12 topics

Java internals

10 topics

Math

3 topics

System administration and DevOps

2 topics

Data science

2 topics

Learn from the industry experts

JetBrains Academy

JetBrains Academy is a part of JetBrains, a global software company specializing in the creation of intelligent, productivity-enhancing tools for software developers and teams. With years of expertise in software development and education, JetBrains Academy empowers more than a million people worldwide to learn and teach computer science, and help organizations inspire their teams to reach their goals in tech. Professional development tools play a big role in computer science education. This is why JetBrains Academy courses offer integration with JetBrains IDEs. This integration assists learners in getting experience with real development processes to streamline their learning curve at future work.

Your peers think Hyperskill rocks

Safire

5 months ago

The topics in Java Core were arranged in a good way, beginner topics being before the advanced ones.

Ekaterina Farygina

1 year ago

Great course! Learned a lot, but sometimes seemed like theory isn't quite nicely connected to some projects. I had some difficulties with tests for some projects