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.

EDUCBA
Skills you'll gain: IntelliJ IDEA, Apache Maven, Build Tools, Integrated Development Environments, Software Development Tools, Version Control, Git (Version Control System), Development Environment, Computer Graphics, Debugging, Scripting Languages, Visualization (Computer Graphics), Databases, Relational Databases
Intermediate · Course · 1 - 4 Weeks

Scrimba
Skills you'll gain: Software Design Patterns, Computational Thinking, Software Design, Algorithms, Program Development, Software Development, Software Engineering, Programming Principles, Computer Programming, Problem Solving, Data Structures, Computer Science, Javascript, Web Development, Machine Learning Methods, Data Science
Intermediate · Specialization · 1 - 4 Weeks

Skills you'll gain: Application Programming Interface (API), Simple Object Access Protocol (SOAP), Application Deployment, Development Environment, Hibernate (Java), OAuth, Back-End Web Development, Eclipse (Software)
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Selenium (Software), Test Tools, Test Automation, Software Testing, Test Script Development, Test Case, Regression Testing, Test Execution Engine, Javascript and jQuery, Browser Compatibility, Automation, Software Design Patterns, UI Components, Java
Intermediate · Course · 1 - 3 Months

Scrimba
Skills you'll gain: Data Visualization, Data Presentation, Web Applications, Full-Stack Web Development, Data Store, Database Development, Query Languages, Data Persistence, Real Time Data, Javascript, User Interface (UI), Software Engineering, Authentications
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: React.js, Context Management, Event-Driven Programming, Web Applications, JavaScript Frameworks, Javascript
Intermediate · Guided Project · Less Than 2 Hours

Scrimba
Skills you'll gain: Web Development Tools, Javascript, Cross Platform Development, Web Applications, Node.JS, Web Development
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Hypertext Markup Language (HTML), HTML and CSS, Web Design and Development, Web Design, Web Content Accessibility Guidelines, Visualization (Computer Graphics), Computer Graphics, Front-End Web Development, Semantic Web, Web Content, Usability, Javascript, Data Validation
Mixed · Course · 1 - 4 Weeks

Coursera
Skills you'll gain: Web Applications, React.js, JavaScript Frameworks, Front-End Web Development, Javascript, Cascading Style Sheets (CSS)
Intermediate · Guided Project · Less Than 2 Hours

Skills you'll gain: React.js, Web Development Tools, JavaScript Frameworks, Front-End Web Development, Javascript, Web Development, Software Engineering
Intermediate · Guided Project · Less Than 2 Hours

University of London
Skills you'll gain: Responsive Web Design, Cascading Style Sheets (CSS), JSON, HTML and CSS, Ajax, Web Content Accessibility Guidelines, Javascript, Web Design, Semantic Web, Usability, Web Applications, Web Development, Web Content, Usability Testing, Interactive Design, Data Structures, Application Frameworks, Network Protocols, Data Ethics, Animations
Build toward a degree
Beginner · Specialization · 1 - 3 Months

Skills you'll gain: Event-Driven Programming, Javascript, Object Oriented Programming (OOP), Web Development, Web Design and Development, Scripting, UI Components, Data Validation, Programming Principles, Development Environment
Beginner · Course · 3 - 6 Months