2021 Comprehensive Java Learning Roadmap: From Fundamentals to a Competitive Offer

Stage 1 – Programming Foundations : Learn Java language basics (data types, control flow, arrays), object‑oriented concepts (methods, inheritance, polymorphism, interfaces, annotations, reflection), and core libraries (collections, generics, I/O). Recommended resources include Bilibili videos by 韩顺平 and Liao Xuefeng’s online tutorial.

Stage 2 – Development Environment : Set up IDEs (Eclipse, IntelliJ IDEA, VS Code), master Linux basics and shell scripting, and become familiar with build tools (Maven, Gradle) and version control (Git, SVN). Resources: Linux tutorials by 韩顺平 and Git courses by 尚硅谷.

Stage 3 – Application Frameworks : Dive into backend frameworks such as Spring (IOC, AOP), Spring MVC, Spring Boot (auto‑configuration, database integration, security, middleware), and related server software (Tomcat, Jetty, Undertow). Explore middleware like Redis, RabbitMQ, Kafka, and RPC frameworks (Dubbo, gRPC, Spring Cloud). Resources: Spring tutorials from 尚硅谷 and related video courses.

Stage 4 – Operations Knowledge : Learn web servers (Nginx), application servers, CDN acceleration, CI/CD with Jenkins, code quality analysis (Sonar), and log collection/analysis using the ELK stack.

Stage 5 – Becoming a “God‑Level” Engineer : Practice reading source code, building projects from scratch, performance tuning, and interview techniques. Emphasize hands‑on coding (4 hours daily: 2 hours theory, 2 hours practice) and systematic problem solving.

Stage 6 – Conclusion : Summarize the importance of a clear learning plan, consistent execution, and community support. Provide additional reading links on code smells, MySQL upgrades, Redis transactions, MVCC principles, and distributed locking.