Most web apps need to store data. Learn relational databases like PostgreSQL or MySQL , and how to interact with them via JDBC or Hibernate (ORM).

Java syntax, variables, and primitive vs. reference types.

Once you know Java, you need to understand how it communicates with the internet.

A unique option for building full-stack web UIs entirely in Java, eliminating the need for separate JavaScript layers like React. Phase 4: Testing & Tools

Understand how to build services that communicate via JSON over HTTP. Phase 3: Industry Frameworks

The dominant framework in 2026 for microservices and enterprise backends. It provides built-in security, data access, and cloud-ready tools.

Essential for managing data. Master List (ArrayList), Set (HashSet), and Map (HashMap).

Java is a powerhouse for web development, particularly for building secure, high-traffic enterprise systems. Learning it for the web requires a structured path starting from foundational "Core Java" to advanced frameworks like Spring Boot.