Free Study Materials & PDF Notes — Java, Spring Boot, SQL, Microservices

Free Java notes PDF for freshers

Core Java Level I–V PDFs covering OOP, collections, multithreading, streams, design patterns, and advanced topics — curated for campus and off-campus placement preparation.

Spring Boot & microservices PDF notes

Spring Framework, Spring Boot, Spring Security, Spring Data JPA, microservices design patterns, Maven/Git, JUnit/Mockito, and Kafka optional modules with downloadable step-by-step notes.

SQL, aptitude & interview prep sheets

SQL practice PDFs, aptitude formulas, coding question sheets, and a full fresher roadmap from Core Java through microservices interview readiness.

Java interview questions 2026 · TCS NQT syllabus · Java learning course