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.

École Polytechnique Fédérale de Lausanne
Skills you'll gain: Scala Programming, Data Structures, Algorithms, Performance Tuning, Other Programming Languages, Functional Design, Performance Testing, Unsupervised Learning, Computer Programming
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Operational Databases, Database Development, Data Maintenance, Java Programming, Enterprise Application Management, Back-End Web Development, Data Access, Full-Stack Web Development, Database Management, Program Development, Business Logic, Frontend Integration
Beginner · Course · 1 - 4 Weeks

Board Infinity
Skills you'll gain: Ajax, jQuery, JSON, Javascript and jQuery, Extensible Markup Language (XML), Web Applications, Javascript, Extensible Languages and XML, Event-Driven Programming, Network Protocols
★ 3.9 (11) · Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Angular, Model View Controller, Web Applications, JavaScript Frameworks, Data Validation, Application Frameworks, Javascript, Application Development, Web Development
★ 4.6 (7) · Intermediate · Guided Project · Less Than 2 Hours

Skills you'll gain: JUnit, Apache Maven, Unit Testing, Spring Framework, Spring Boot, Restful API, API Testing, Software Testing, Test Case, Application Programming Interface (API), Gradle, Build Tools, Software Development Tools, Integration Testing, Application Frameworks, Authentications
Intermediate · Course · 1 - 3 Months

Skills you'll gain: React.js, JavaScript Frameworks, Javascript and jQuery, Javascript, Software Design Patterns, Code Reusability, Web Development, Application Development, Mobile Development
★ 4.4 (8) · Advanced · Guided Project · Less Than 2 Hours

Skills you'll gain: Spring Framework, Spring Boot, Model View Controller, Hibernate (Java), Java, Java Programming, Web Development, Web Applications, Secure Coding, Application Frameworks, Object-Relational Mapping, Application Deployment, Application Security, Database Application, Database Development, Software Development Tools, Authentications, Development Environment, Data Access, Authorization (Computing)
Intermediate · Course · 3 - 6 Months

Coursera
Skills you'll gain: Vue.JS, JavaScript Frameworks, Hypertext Markup Language (HTML), Web Development Tools, Web Applications, Front-End Web Development, HTML and CSS, Javascript, Microsoft Visual Studio, Data Storage
★ 4.6 (11) · Intermediate · Guided Project · Less Than 2 Hours

LearnKartS
Skills you'll gain: Git (Version Control System), Integrated Development Environments, Version Control, IntelliJ IDEA, Software Development Tools, Eclipse (Software), Microsoft Visual Studio, Development Environment, Software Versioning, Software Development, Release Management, Collaborative Software, Software Development Methodologies, Change Control
Intermediate · Course · 1 - 3 Months

EDUCBA
Skills you'll gain: Integrated Development Environments, Web Applications, HTML and CSS, Python Programming, Javascript, Design
★ 4.2 (19) · Beginner · Course · 1 - 4 Weeks

Board Infinity
Skills you'll gain: CI/CD, Jenkins, Docker (Software), Continuous Integration, Containerization, Cloud-Native Computing, Scalability, Application Deployment, Cloud Deployment, Continuous Deployment, Spring Framework, Spring Boot, DevOps, Prometheus (Software), Amazon CloudWatch, AWS Identity and Access Management (IAM), Identity and Access Management, Load Balancing, OAuth, Performance Tuning
Advanced · Course · 1 - 4 Weeks

Skills you'll gain: Application Programming Interface (API), Javascript, Web Development
Intermediate · Course · 1 - 4 Weeks