1. Core Java Concepts:
Object-Oriented Programming (OOP)
Exception Handling
Multithreading
Collections Framework
Generics
Java I/O (Input/Output)
Lambda Expressions and Streams (Java 8 and beyond)
2. Java Frameworks:
Spring Framework: Comprehensive framework for enterprise applications.
Hibernate: ORM (Object Relational Mapping) framework.
Apache Struts: For building web applications.
Play Framework: Lightweight and reactive web application framework.
3. Build Tools:
Maven
Gradle
4. Java Testing Frameworks:
JUnit
TestNG
5. Web Development with Java:
Servlets and JSP (Java Server Pages)
Spring MVC
Thymeleaf
6. Java for Microservices:
Spring Boot
Spring Cloud
Quarkus
7. Database Integration:
JDBC (Java Database Connectivity)
JPA (Java Persistence API)
8. IDEs for Java Development:
IntelliJ IDEA
Eclipse
NetBeans
9. Advanced Concepts:
JVM (Java Virtual Machine) Internals
Garbage Collection
Memory Management
Reflection API
10. Java for Cloud and Distributed Systems:
Apache Kafka
Apache Hadoop
Kubernetes (with Java apps)
11. Networking in Java:
Sockets and ServerSockets
RMI (Remote Method Invocation)
12. Popular Java Libraries:
Apache Commons
Google Guava
Jackson (for JSON parsing)
13. Java for Android Development:
Android Studio
Java SDK
Free books and courses to learn Java👇👇
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https://introcs.cs.princeton.edu/java/11cheatsheet/
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