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.

University of California San Diego
Skills you'll gain: Debugging, Object Oriented Programming (OOP), Object Oriented Design, Java Programming, Java, Teaching, Programming Principles, Program Development, Pedagogy, Computer Programming, Software Design, Computational Thinking, Education Software and Technology, Cultural Responsiveness, Digital pedagogy, Test Case, Computational Logic, Algorithms, Data Structures
Beginner · Specialization · 3 - 6 Months

Skills you'll gain: AWS Identity and Access Management (IAM), Amazon S3, Amazon Elastic Compute Cloud, Identity and Access Management, Amazon Web Services, User Provisioning, Cloud Storage, Multi-Factor Authentication, Data Storage Technologies, Cloud Infrastructure, Cloud Solutions, Cloud Services, Cloud Computing, Role-Based Access Control (RBAC), Cloud Management, Virtual Networking, Network Architecture, Network Security, Encryption
Beginner · Course · 1 - 3 Months

Skills you'll gain: Email Security, Cybersecurity, Malware Protection, Network Security, Application Security, Information Systems Security, Cyber Security Strategy, Authentications, Data Security, Risk Management, Security Controls, Multi-Factor Authentication, Security Software, Threat Management, Risk Management Framework, Cryptography, Endpoint Security, Firewall, Threat Detection, Operating Systems
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Apache Kafka, Real Time Data, Event-Driven Programming, Data Pipelines, Data Processing, Distributed Computing, Scalability, Systems Architecture, Software Architecture, DevOps, Docker (Software), Fraud detection, Configuration Management
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: React Redux, React.js, Front-End Web Development, Frontend Performance, JavaScript Frameworks, Web Development Tools, Event-Driven Programming, Web Applications, Performance Tuning, Javascript, TypeScript, UI Components, Application Development, User Interface (UI), Context Management, E-Commerce
Intermediate · Course · 1 - 3 Months

SkillUp
Skills you'll gain: Hibernate (Java), Object-Relational Mapping, Spring Boot, Restful API, Java, NoSQL, Database Development, Spring Framework, SQL, Database Systems, Databases, Database Design, Application Frameworks, Java Programming, Data Access, Database Management, Relational Databases, Back-End Web Development, Software Development
Intermediate · Course · 1 - 4 Weeks

LearnQuest
Skills you'll gain: Scripting Languages, Scripting, Java, Java Programming, Server Side, Web Applications, Web Components
Intermediate · Course · 1 - 4 Weeks

Coursera
Skills you'll gain: Unit Testing, JUnit, Test Case, Software Testing, Software Development, Software Engineering, Java Programming, Java
Beginner · Guided Project · Less Than 2 Hours

Coursera
Skills you'll gain: Object Oriented Programming (OOP), Java, Object Oriented Design, Java Programming, Computer Programming
Intermediate · Guided Project · Less Than 2 Hours

Skills you'll gain: Database Design, Frontend Integration, Continuous Integration, Restful API, Database Development, Docker (Software), Model View Controller, Front-End Web Development, Relational Databases, Databases, Web Design and Development, User Story, CI/CD, Java, Java Programming, Database Application, Full-Stack Web Development, Spring Boot, Back-End Web Development, Software Design Documents
Advanced · Course · 1 - 3 Months

Packt
Skills you'll gain: Java, Object Oriented Design, File I/O, Web Servers, Program Development, Server Side, Programming Principles, Test Engineering, Code Reusability, Animation and Game Design, Encryption, Software Installation, Application Deployment
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Front-End Web Development, Application Programming Interface (API), Event-Driven Programming, Frontend Performance, Development Environment, Data Sharing
Beginner · Course · 1 - 3 Months