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Java Courses on DataCamp

Explore our entire Java curriculum. Java is a versatile programming language used in everything from mobile apps to enterprise systems. Start programming with confidence through interactive courses and easy-to-follow guides.

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Java courses for beginners

Build practical Java skills from scratch with interactive, expert-led courses.

Courses

Java入門

基本スキルレベル
4 hours
4.9K
この初心者向けのコースでJavaを基礎から学び、重要なプログラミングの概念とスキルを習得しましょう。

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Courses

Java入門

基本スキルレベル
4 hours
4.9K
この初心者向けのコースでJavaを基礎から学び、重要なプログラミングの概念とスキルを習得しましょう。

Courses

中級 Java

基本スキルレベル
4 hours
1.6K
methods、制御フロー、ループを使って、より読みやすく賢いJavaコードを書く力を身につけましょう。

Courses

Javaにおけるデータ型と例外処理

中級スキルレベル
4 hours
557
Plain Old Java Objectsの操作を学び、Collections Frameworkを極め、例外処理をプロ並みに。さらにloggingで確実に支援します。

Courses

Input/Output and Streams in Java

中級スキルレベル
4 hours
493
Advance your Java skills by learning to handle files, process data, and build clean, reusable code using real-world techniques.

Courses

Querying a PostgreSQL Database in Java

高度なスキルレベル
3 hours
312
Connect Java to PostgreSQL with JDBC. Write secure queries, manage transactions, and handle large datasets efficiently.

Courses

Optimizing Code in Java

高度なスキルレベル
3 hours
273
Learn key techniques to optimize Java performance, from algorithm efficiency to JVM tuning and multithreading.

Courses

Javaによるテスト入門

高度なスキルレベル
3 hours
191
JUnitとMockitoで効果的なテストの書き方を学び、堅牢で信頼性の高いJavaアプリを自信を持って構築しましょう。

Courses

Importing Data in Java

中級スキルレベル
3 hours
172
Learn to import, manipulate, and transform data in Java using the Tablesaw library. Work with CSV files, tabular structures, and complex JSON formats.

Courses

Cleaning Data in Java

中級スキルレベル
4 hours
139
Master data cleaning in Java using statistical methods, transformations, and validation for reliable apps.

Tracks

Javaの基礎

20 hours
3.5K
Javaの基礎を学び、世界で最も広く使用されているプログラミング言語の一つを用いて、実際のアプリケーションの開発を始めましょう。

Tracks

Java開発者

21 hours
319
Java開発を基礎からテスト、最適化まで習得しましょう。信頼性が高く、すぐにリリースできるアプリケーションを構築します。

Tracks

データエンジニア Javaにおいて

27 hours
147
データエンジニアリングに必要なJavaスキルを習得しましょう。ファイル処理やデータベース統合からパフォーマンス最適化まで、幅広く学んでいただけます。

javaの関連リソース

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61 Java Interview Questions And Answers For All Levels

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Frequently asked questions

Is Java suitable for beginners?

Yes, Java is suitable for beginners due to its clear syntax and widespread documentation. 

Many find it a good starting point, as learning Java can make it easier to understand other programming languages later.DataCamp’s Introduction to Java course makes learning easy. You’ll start with the basics and build a strong foundation in programming concepts through hands-on exercises.

How long does it take to learn Java?

Learning Java can take anywhere from a few weeks to several months, depending on your prior programming experience and how much time you dedicate.

Roughly, it will take one month for someone who already knows how to code, or as long as 12–18 months for beginners. However, with DataCamp’s interactive courses, beginners can grasp the fundamentals in just a few hours. 

Alongside independent study, beginners can get comfortable with applying basic Java concepts in a few weeks.

Mastering more technical object-oriented programming skills will take longer. Gaining the skills to write clean, reusable, and maintainable code using OOP principles in Java requires a deeper understanding and will subsequently take longer.

What skills do I need to start learning Java?

To start learning Java, you don’t need prior programming knowledge, but familiarity with basic computer operations and problem-solving skills can help. Java courses often start with fundamental concepts that ease you into programming.

Is Java worth learning in 2025?

Yes, Java is worth learning as it remains one of the most widely used programming languages. 

Java is essential for enterprise software, web development, mobile applications, and backend systems—making it a valuable skill across multiple technology careers.

Even with newer languages emerging, Java's stability and large community support ensure its continued relevance and value.

Indeed, its performance, scalability, and large ecosystem make it highly relevant for developing software in finance, e-commerce, data processing, and other fields.

How can Java courses help me in my career?

Java courses can help you in your career by providing in-demand programming skills that open doors to multiple roles including:

  • Backend developer
  • Android developer
  • Data engineer
  • Software developer
  • And more

Java’s widespread use in enterprise applications make it a valuable skill to master, boosting your employability and career growth.

What skills do I need to start learning Java?

To start learning Java, you don’t need prior programming knowledge, but familiarity with basic computer operations and problem-solving skills can help. 

As mentioned, if you already have coding skills, it will accelerate the learning process. 

Our Introduction to Java course starts with fundamental concepts that ease you into programming through interactive exercises anyone can start today

Do I need to install software for DataCamp’s Java courses?

No, with our Java courses, you can learn and practice Java directly in your browser, without having to install any software.

Most other Java course providers require you to install the Java Development Kit (JDK).

What can I build with Java?

With Java, you can build a wide range of applications, including web applications, mobile apps (especially Android apps), desktop applications, enterprise software, scientific applications, chatbots, email systems, artificial intelligence systems, gaming applications, and data management systems like customer relationship management (CRM) tools.

The breadth of applications is due to Java's versatility and cross-platform compatibility, which make Java programming knowledge invaluable across multiple technology roles and industries. Alongside, it guarantees Java's ongoing relevance.

Is Java good for data science?

While Java isn’t as common in data science as Python, it can be useful for large-scale data processing and integration with enterprise-level applications.

Some data processing frameworks, like Apache Spark, support Java, making it valuable in certain data science contexts.

What’s the difference between Java and JavaScript?

Java and JavaScript are two distinct programming languages with different purposes.

Java is primarily used for backend and application development, while JavaScript is typically used for front-end web development to add interactivity to websites.

Is Java harder to learn than Python?

Java has a steeper learning curve than Python due to its syntax and object-oriented focus, but it’s not necessarily harder to learn.

With consistent practice and interactive exercises, beginners can build proficiency in Java just as effectively.

Is Java used in artificial intelligence?

While Java isn’t the primary language for AI, it is sometimes used for building scalable AI applications and backend systems thanks to its robust features like garbage collection and ability to handle large datasets efficiently. 

In this, Java’s performance and stability make it suitable for AI applications that require reliable, large-scale deployments.

What are some popular Java frameworks?

Popular Java frameworks include Spring, Hibernate, and Apache Struts.

These frameworks simplify complex tasks like building web applications, managing databases, and enhancing performance.

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