Core Java courses can help you learn object-oriented programming, exception handling, multithreading, and Java Collections. 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.

Google Cloud
Skills you'll gain: Google App Engine, Cloud Deployment, Application Deployment, Cloud Development, Cloud Applications, Java, Google Cloud Platform, Cloud Services, Application Development, Cloud Computing, Java Programming, Cloud Platforms, DevOps
Beginner · Project · Less Than 2 Hours

Skills you'll gain: Salesforce, Salesforce Development, Customer Relationship Management (CRM) Software, Customer Relationship Management, Data Validation, Cloud Computing Architecture, Object-Relational Mapping, Cloud Computing, Application Design, Data Integrity, System Configuration, Relationship Management, Automation
Intermediate · Course · 1 - 3 Months

Coursera
Skills you'll gain: Backlogs, Agile Project Management, Agile Software Development, Agile Product Development, Agile Methodology, Team Building, Team Oriented, Product Management, Project Management, Team Management, Project Management Life Cycle, Cross-Functional Collaboration, Case Studies, Meeting Facilitation, Prioritization, Continuous Improvement Process, Product Development, Discussion Facilitation, Communication
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Data Structures, Graph Theory, Algorithms, Java Programming, Java, Data Management, Secure Coding, Theoretical Computer Science, Performance Tuning, Computer Programming
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Angular, Command-Line Interface, Frontend Performance, Data Sharing
Beginner · Course · 3 - 6 Months

Skills you'll gain: MySQL, Java, Data Access, Data Store, Database Application, Database Development, Java Programming, Databases, Software Development, Data Storage, Program Development, Computer Programming
Advanced · Guided Project · Less Than 2 Hours

LearnQuest
Skills you'll gain: Relational Databases, SQL, Databases, Data Access, Data Manipulation, Database Development, Database Management Systems, Java Platform Enterprise Edition (J2EE), Query Languages
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: TCP/IP, Network Protocols, Network Troubleshooting, General Networking, Network Planning And Design, Computer Networking, Network Analysis, Computational Logic
Intermediate · Course · 1 - 3 Months

University of Pennsylvania
Skills you'll gain: File I/O, Matplotlib, Object Oriented Design, Java, Object Oriented Programming (OOP), Data Analysis, Unit Testing, Pandas (Python Package), Java Programming, Plot (Graphics), Eclipse (Software), Application Development, Data Visualization, Data Structures, Data Science, Data Cleansing, Programming Principles, Computer Programming Tools, Python Programming, Computer Programming
Beginner · Specialization · 3 - 6 Months

Skills you'll gain: Selenium (Software), JUnit, HTML and CSS, Test Automation, Hypertext Markup Language (HTML), Software Testing, Web Design and Development, Test Script Development, Test Tools, Web Development, Unit Testing, Software Quality Assurance, Java, Data Structures, Java Programming, Cascading Style Sheets (CSS), Test Execution Engine, Code Reusability, Debugging, Software Design Patterns
Intermediate · Course · 1 - 3 Months

Skills you'll gain: ASP.NET, Restful API, Web Development, Object-Relational Mapping, Web Applications, User Accounts, Data Integrity, Single Sign-On (SSO), .NET Framework, API Design, Application Programming Interface (API), Database Application, Authentications, Back-End Web Development, Performance Tuning, Authorization (Computing), Data Management, Relational Databases, Identity and Access Management, Model View Controller
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Java, Mobile Development, Java Programming, Object Oriented Programming (OOP), Application Frameworks, Android Development, Application Development, Program Development, Software Development
Intermediate · Guided Project · Less Than 2 Hours