Java courses can help you learn object-oriented programming, data structures, exception handling, and multithreading concepts. You can build skills in writing efficient algorithms, debugging code, and developing user interfaces. Many courses introduce tools like Eclipse and IntelliJ IDEA, which are commonly used for coding and testing Java applications, along with frameworks such as Spring and Hibernate that facilitate web development and database management.

Scrimba
Skills you'll gain: React.js, Javascript
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: React.js, Application Deployment, Web Applications, Javascript, Bootstrap (Front-End Framework), Development Environment, User Interface (UI), Cascading Style Sheets (CSS), Application Programming Interface (API), GitHub
Beginner · Course · 1 - 3 Months

Board Infinity
Skills you'll gain: Kotlin, Android Jetpack, Cross Platform Development, Mobile Development, Android Studio, Back-End Web Development, Server Side, Google Cloud Platform, Cloud Development, Apple Xcode, MongoDB, Cloud Applications, User Interface (UI), Cloud Hosting, Web Applications, Systems Integration, Gradle, Restful API, Integration Testing, Application Deployment
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Responsive Web Design, Cascading Style Sheets (CSS), HTML and CSS, Javascript, Web Design, Event-Driven Programming, Web Design and Development, Development Environment, Web Development, User Interface and User Experience (UI/UX) Design, Web Applications, Software Development Tools, Interactive Design, Animations, Typography, Color Theory, Web Analytics and SEO, Debugging, Data Validation
Beginner · Specialization · 1 - 3 Months

Skills you'll gain: AWS Identity and Access Management (IAM), Linux Administration, Amazon Elastic Compute Cloud, Linux Servers, Identity and Access Management, Cloud Infrastructure, Amazon Web Services, Cloud Hosting, Cloud Computing, Front-End Web Development, Cloud Management, Linux, Ubuntu, Operating System Administration, Application Deployment, React.js, Event-Driven Programming, Javascript, User Interface (UI), Apache
Intermediate · Specialization · 3 - 6 Months

Skills you'll gain: Jest (JavaScript Testing Framework), Unit Testing, Test Case, React.js, Test Driven Development (TDD), Software Testing, Web Development Tools, Ajax, Javascript
Intermediate · Guided Project · Less Than 2 Hours

Skills you'll gain: React.js, JavaScript Frameworks, Javascript and jQuery, Javascript, TypeScript, Software Design Patterns, Web Development, Application Development, Mobile Development
Advanced · Guided Project · Less Than 2 Hours

Coursera
Skills you'll gain: Data Visualization Software, Data Visualization, Interactive Data Visualization, Visualization (Computer Graphics), JSON, Data Mapping, Javascript
Intermediate · Guided Project · Less Than 2 Hours

Coursera
Skills you'll gain: Ajax, JSON, JavaScript Frameworks, Javascript, Application Programming Interface (API), Restful API, Web Applications, Real Time Data, Application Security
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Selenium (Software), Test Automation, Test Tools, Test Data, Test Case, Unit Testing, Software Testing, Test Execution Engine, Regression Testing, Integration Testing, Java, Performance Testing, Automation
Intermediate · Course · 3 - 6 Months

Skills you'll gain: Apache Maven, Jenkins, Apache Tomcat, Application Deployment, Java, DevOps, Amazon Web Services, CI/CD, Amazon Elastic Compute Cloud, Git (Version Control System)
Beginner · Course · 1 - 3 Months

Board Infinity
Skills you'll gain: Hibernate (Java), Multi-Tenant Cloud Environments, Object-Relational Mapping, Spring Boot, Performance Tuning, Java, Authentications
Intermediate · Course · 1 - 4 Weeks