java-ramp-up

Java Ramp-Up is a personal 90-day Java learning challenge, shared publicly as a structured curriculum with a daily checklist. It is designed to take someone from Java fundamentals all the way to production-ready Spring Boot microservices (Spring Boot is a popular Java framework for building web applications and services).

The curriculum is divided into three phases. Phase 1 (Days 1-30) covers Java OOP Foundations: the basics of the Java language, object-oriented programming concepts like classes, inheritance, interfaces, and polymorphism, plus core data structures like ArrayList, HashMap, and HashSet. Phase 2 (Days 31-60) covers Advanced Java and Lambdas: the Java Collections Framework in depth, generics, exception handling, file I/O, concurrency, and the functional programming features added in modern Java (lambda expressions, streams, Optional, CompletableFuture, records, sealed classes). Phase 3 (Days 61-90) covers Spring Boot and Microservices: building REST APIs, data persistence with JPA (Java Persistence API, a standard way to store data in a database), Spring Security, testing, and containerization. A bonus section covers Kafka, Grafana, Docker, and Kubernetes.

Each day is a concrete checkbox task with a specific topic and a small project or exercise. Phase capstone projects include a Library Management System (Phase 1), a Banking Application with concurrent transaction handling (Phase 2 milestone), and a production-deployed microservice (Phase 3 goal). The repo was created as a personal study tracker (Self Challenge Journey) and uses JDK 21 and either IntelliJ IDEA or VS Code as the development environment. The full README is longer than what was provided.