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.

LearnQuest
Skills you'll gain: Relational Databases, SQL, Databases, Data Access, Data Manipulation, Database Management, Query Languages
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Java, Java Programming, Object Oriented Design, Object Oriented Programming (OOP), User Interface (UI) Design, Unit Testing, JUnit, Data Validation, Software Development, Application Design, Development Testing, Application Development, Test Automation, Test Case, Data Modeling, System Design and Implementation, Databases, Software Documentation, Development Environment, Software Testing
Beginner · Specialization · 1 - 3 Months

Duke University
Skills you'll gain: File I/O, Java Programming, Object Oriented Programming (OOP), Data Structures, Java, Cryptography, Software Engineering, Computer Programming, Algorithms, Encryption, Web Servers
Beginner · Course · 1 - 3 Months

Rice University
Skills you'll gain: Apache Kafka, Apache Spark, Apache Hadoop, Distributed Computing, Dataflow, Java Programming, Java, Software Architecture, Systems Architecture, Scala Programming, Data Structures, System Programming, Programming Principles, Servers, Application Frameworks, Debugging, Algorithms, Performance Tuning, Functional Design, Performance Testing
Intermediate · Specialization · 3 - 6 Months

Skills you'll gain: Restful API, Postman API Platform, API Design, Application Programming Interface (API), API Testing, Authentications, Object-Relational Mapping, Development Environment, Microsoft Development Tools, Microsoft Visual Studio, Web Development Tools, Authorization (Computing), Endpoint Security, Data Validation
Intermediate · Course · 1 - 3 Months

Skills you'll gain: Operating System Administration, Remote Access Systems, Local Area Networks, Software Installation, Command-Line Interface, Microsoft Windows, System Configuration, Threat Detection, System Support, Information Technology Operations, Wireless Networks, Network Security, Desktop Support, Mobile Security, Peripheral Devices, USB, Operating Systems, Computer Hardware, Data Storage Technologies, Hardware Troubleshooting
Beginner · Specialization · 3 - 6 Months

Skills you'll gain: Database Development, Performance Tuning, Systems Development, System Monitoring, System Requirements, Business Reporting, Verification And Validation
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Application Design, Secure Coding, JSON
Intermediate · Course · 1 - 3 Months

Skills you'll gain: GitHub, Version Control, Bootstrap (Front-End Framework), .NET Framework, Model View Controller, Cross Platform Development, Microsoft Development Tools, Development Environment, Authentications, Web Applications, jQuery, Software Development Tools, Responsive Web Design, Data Validation, Microsoft SQL Servers, Databases
Beginner · Course · 1 - 3 Months

Skills you'll gain: System Configuration, Linux, Information Systems Security, Network Routers, Performance Tuning, Mac OS, Information Technology, Email Security, System Support, Android (Operating System), Data Maintenance, Network Security, File Systems, Multi-Factor Authentication, Scripting, Virtualization and Virtual Machines, Apple iOS, Hardware Troubleshooting, Artificial Intelligence, Authentications
Beginner · Specialization · 3 - 6 Months

Skills you'll gain: Database Application, Full-Stack Web Development, Web Applications, Model View Controller, Authentications, Business Logic, SQL
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Object Oriented Design, Object Oriented Programming (OOP), Unit Testing, Java, Test Automation, Software Development, Development Testing, Application Design, Software Testing, Application Development, System Design and Implementation, Data Validation, User Interface (UI), Debugging, Data Integrity, Business Logic
Beginner · Course · 1 - 4 Weeks