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: Spring Boot, Database Design, Object-Relational Mapping, Application Frameworks, Data Modeling, Database Development, Java Platform Enterprise Edition (J2EE), Application Development, Database Architecture and Administration, Requirements Analysis
Beginner · Guided Project · Less Than 2 Hours

LearnKartS
Skills you'll gain: Git (Version Control System), GitHub, Bitbucket, Version Control, Software Versioning, GitLab, Software Configuration Management, Collaborative Software, Integrated Development Environments, Software Development, Software Installation, Code Review, Devops Tools, IntelliJ IDEA, Eclipse (Software), File Management, Application Lifecycle Management, Linux, Release Management, Command-Line Interface
Beginner · Specialization · 1 - 3 Months

Scrimba
Skills you'll gain: React Redux, React.js, Cascading Style Sheets (CSS), JavaScript Frameworks, Front-End Web Development, Network Routing, User Interface (UI), UI Components, Web Frameworks, Maintainability, Authentications, Web Development Tools, Application Frameworks, Application Programming Interface (API), Web Design, Restful API, Authorization (Computing), Software Design, Javascript, Web Development
Intermediate · Specialization · 1 - 3 Months

Skills you'll gain: Pseudocode, Computational Thinking, Debugging, Algorithms, Front-End Web Development, Javascript, Computer Programming, Data Structures, JSON, Web Development, Object Oriented Programming (OOP)
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Extensible Markup Language (XML), Ajax, Extensible Languages and XML, Web Design, Java Platform Enterprise Edition (J2EE), Cascading Style Sheets (CSS), Data Validation, Web Applications, Scripting, Javascript and jQuery, Web Development, Android Development, Hypertext Markup Language (HTML), Middleware, Model View Controller, Web Services, Hibernate (Java), Visualization (Computer Graphics), Java, Mobile Development
Beginner · Specialization · 3 - 6 Months

Scrimba
Skills you'll gain: React.js, Routing Protocols, JavaScript Frameworks, Web Content Accessibility Guidelines, Front-End Web Development, UI Components, Performance Tuning, Debugging, Javascript, Software Design Patterns, Real Time Data, Authentications
Advanced · Course · 1 - 3 Months

Skills you'll gain: Javascript, Data Structures, Scripting, Computer Programming
Advanced · Guided Project · Less Than 2 Hours

Board Infinity
Skills you'll gain: Middleware, Node.JS, Development Environment, Application Development, JavaScript Frameworks, TypeScript, Web Applications, Web Development Tools, Application Programming Interface (API), Server Side, Javascript, Android Development, Dependency Analysis
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Node.JS, Scalability, Authentications, JSON, Authorization (Computing), Web Applications, Web Development, Server Side, Back-End Web Development, Application Frameworks, Performance Tuning, Javascript, Restful API, Development Environment, Event-Driven Programming, Operating Systems, Email Automation, Microsoft Visual Studio, Debugging
Intermediate · Course · 1 - 4 Weeks

Board Infinity
Skills you'll gain: Software Documentation, Java, Back-End Web Development, Application Programming Interface (API), Application Deployment, Databases
Beginner · Course · 1 - 4 Weeks

Coursera
Skills you'll gain: Javascript, Event-Driven Programming, Web Design and Development, Interactive Design, Web Applications, Interaction Design, Scripting, UI Components, Web Development, Scripting Languages, Data Validation
Beginner · Guided Project · Less Than 2 Hours

Skills you'll gain: Selenium (Software), Test Automation, Software Testing, Test Data, Browser Compatibility, Test Case, Java, Automation, Web Development Tools, Debugging
Intermediate · Course · 1 - 3 Months