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.

Coursera
Skills you'll gain: Version Control, GitLab, Continuous Integration, Software Versioning, CI/CD, Git (Version Control System), Software Development Tools, Javascript
Beginner · Guided Project · Less Than 2 Hours

Skills you'll gain: TypeScript, Object Oriented Design, Node.JS, Role-Based Access Control (RBAC), Object Oriented Programming (OOP), Webpack, React Redux, Back-End Web Development, React.js, Full-Stack Web Development, Web Development, MongoDB, Front-End Web Development, Javascript, Application Programming Interface (API), Software Design Patterns, API Design, Programming Principles, Software Development, Debugging
Beginner · Specialization · 3 - 6 Months

Skills you'll gain: Apache Maven, Eclipse (Software), JUnit, Data Import/Export, Kotlin, Software Installation, Database Management, File Management
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Selenium (Software), GitHub, Git (Version Control System), Version Control, CI/CD, File I/O, Object Oriented Programming (OOP), Test Automation, JUnit, Test Data, Unit Testing, Test Case, Regression Testing, Web Development Tools, Test Script Development, Software Testing, Javascript, Browser Compatibility, Scripting, Computer Programming
Beginner · Specialization · 3 - 6 Months

Skills you'll gain: JUnit, Apache Maven, Unit Testing, Spring Framework, Spring Boot, Restful API, API Testing, Software Testing, Test Case, Gradle, Software Development Tools, Integration Testing, Mockups, JSON, Authentications
Intermediate · Course · 1 - 3 Months

Skills you'll gain: Cascading Style Sheets (CSS), UI Components, Front-End Web Development, User Interface (UI), Web Design, React.js, Responsive Web Design, User Experience, Typography, Javascript
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Blockchain, Front-End Web Development, Application Development, Application Design, Web Development, Transaction Processing, User Interface (UI), Development Testing, Cryptography, Emerging Technologies, HTML and CSS, Software Architecture, User Interface (UI) Design, Experience Design, Javascript, Application Deployment, Software Development Tools, Scalability, Data Management
Intermediate · Course · 1 - 4 Weeks

Johns Hopkins University
Skills you'll gain: Apache Hadoop, Big Data, Apache Hive, Apache Spark, NoSQL, Data Infrastructure, File Systems, Data Processing, Data Management, Analytics, Data Science, Databases, SQL, Query Languages, Data Manipulation, Java, Data Structures, Distributed Computing, Scripting Languages, Performance Tuning
Intermediate · Specialization · 3 - 6 Months

Skills you'll gain: Authentications, OAuth, API Testing, Restful API, Application Programming Interface (API), JSON, Test Automation, Data Validation, Extensible Markup Language (XML), Mockups, Test Tools, Simple Object Access Protocol (SOAP), Virtualization, Debugging
Intermediate · Course · 1 - 3 Months

Scrimba
Skills you'll gain: Cascading Style Sheets (CSS), HTML and CSS, Front-End Web Development, Javascript, Responsive Web Design, Maintainability
Intermediate · Course · 1 - 4 Weeks

Scrimba
Skills you'll gain: React Redux, React.js, JavaScript Frameworks, Javascript, Web Development Tools, Middleware, Web Development
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Node.JS, Restful API, Application Programming Interface (API), Back-End Web Development, Microsoft Visual Studio, Web Applications, Javascript, Application Development
Intermediate · Guided Project · Less Than 2 Hours