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.

Vanderbilt University
Skills you'll gain: Android Studio, Android Development, Object Oriented Programming (OOP), Android (Operating System), Java Programming, Java, Mobile Development, Object Oriented Design, Data Structures, Integrated Development Environments, Programming Principles, Computer Programming, Development Environment
★ 4.5 (3.1K) · Beginner · Course · 1 - 3 Months

Skills you'll gain: Java Programming, Development Environment, Java, Integrated Development Environments, Key Management, Software Development Tools, Cryptographic Protocols, Encryption, Cryptography, Performance Tuning, Memory Management, Scalability, Software Installation
Intermediate · Course · 1 - 3 Months

Skills you'll gain: Selenium (Software), Ajax, Java Programming, Test Script Development, Java, Software Testing, Test Automation, Scripting, Automation, Cascading Style Sheets (CSS)
★ 4.9 (7) · Intermediate · Course · 3 - 6 Months

Skills you'll gain: Java Platform Enterprise Edition (J2EE), Java Programming, Object-Relational Mapping, Java, Application Servers, Middleware, Application Deployment, Data Persistence, Event-Driven Programming, Enterprise Application Management, Server Side, Code Reusability, Context Management, Transaction Processing, Business Logic, Query Languages
★ 4.8 (56) · Intermediate · Course · 1 - 4 Weeks

EDUCBA
Skills you'll gain: Object Oriented Programming (OOP), Java Programming, Java, Object Oriented Design, File I/O, Application Development, Data Access, Systems Development, Computer Programming, User Interface (UI), Application Design, UI Components, Program Development, Programming Principles, Database Application, Database Management, Databases, System Design and Implementation, Event-Driven Programming, Integrated Development Environments
★ 4.9 (20) · Beginner · Course · 1 - 3 Months

Skills you'll gain: Spring Framework, JUnit, Restful API, Spring Boot, Unit Testing, Java Programming, Java, Hibernate (Java), Model View Controller, Java Platform Enterprise Edition (J2EE), Web Services, Object-Relational Mapping, Software Testing, Test Script Development, Apache Maven, Data Access, Databases, Database Management, Web Applications, Gradle
Beginner · Course · 3 - 6 Months

Skills you'll gain: Java Programming, Java, Performance Tuning, System Programming, Code Reusability, Application Performance Management, Algorithms, JUnit, OS Process Management, Application Frameworks, Frontend Performance, Frontend Integration, Programming Principles, Spring Boot
Beginner · Course · 1 - 3 Months

Skills you'll gain: Web Services, Restful API, Apache Maven, Build Tools, Spring Boot, Spring Framework, Gradle, Simple Object Access Protocol (SOAP), Application Programming Interface (API), Java, Java Programming, API Design, Object-Relational Mapping, Data Persistence, JSON, Extensible Markup Language (XML)
Intermediate · Course · 3 - 6 Months

Peking University
Skills you'll gain: Java Programming, Java, Object Oriented Programming (OOP), Object Oriented Design, Computer Programming, C and C++, JUnit, Programming Principles, Network Model, UI Components, Software Design Patterns, User Interface (UI), Data Access, Data Structures, Application Development, File I/O, Event-Driven Programming, Maintainability, Software Development Tools
★ 4.7 (209) · Intermediate · Course · 1 - 3 Months
Skills you'll gain: Java, Java Programming, Performance Tuning, Data Structures, Software Engineering, Tree Maps, Scalability, Algorithms, Benchmarking, Theoretical Computer Science
Advanced · Course · 1 - 4 Weeks

LearnQuest
Skills you'll gain: Java Programming, Java, Object Oriented Programming (OOP), Object Oriented Design, Software Design, Functional Design
★ 4.7 (213) · Intermediate · Course · 1 - 3 Months

Skills you'll gain: Java Programming, Java Platform Enterprise Edition (J2EE), JUnit, Software Documentation, Application Frameworks, Development Environment, Application Design, Software Testing, Performance Tuning, Data Persistence, Maintainability
Intermediate · Course · 1 - 4 Weeks