Java

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Java tutorials, programs, and interview questions — from core Java basics to Spring, Hibernate, and advanced topics.

Start with the Java Learning Roadmap 2026: the complete guided path from your first program to job-ready production Java.

1. Core Java

The foundation everything else stands on: modern Java 25, the type system, OOP done right, and the standard library. (18 posts — all live)

  1. Java Setup 2026: JDK 25, IntelliJ/VS Code, Your First Program
  2. Variables, Types & Operators — Java's Type System, Precisely
  3. Control Flow: if/switch/loops (with the modern switch)
  4. OOP in Java: Classes, Objects, Constructors
  5. Inheritance, Polymorphism & Abstraction — Done Right
  6. Interfaces, Default Methods & Functional Interfaces
  7. Equality, Identity & Hashing: ==, equals(), hashCode()
  8. Strings: Immutability, StringBuilder & the String Pool
  9. Enums & Annotations: The Language Mechanism Behind the Magic
  10. Exceptions: Checked vs Unchecked, and Clean Error Handling
  11. Collections I: List, Set, Map — The Essential Tour
  12. Collections II: How HashMap Really Works
  13. Generics & Wildcards: PECS Without Tears
  14. Lambdas & Functional Interfaces
  15. Streams, Collectors & Optional
  16. Records, Sealed Classes & Pattern Matching (Java 17+)
  17. Date, Time & Money: java.time and BigDecimal Done Right
  18. Files, I/O & NIO: Reading and Writing Data

2. Java Tooling & Testing

Maven vs Gradle, JUnit 5 & Mockito, Testcontainers, Docker for Java, CI/CD with GitHub Actions, Gatling load testing, SpotBugs/Checkstyle/SonarQube static analysis, JaCoCo code coverage, and PIT mutation testing — the tooling Spring assumes you already know. (10 posts — all live)

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3. Spring Boot & APIs

Your first REST API, DI, JDBC before JPA, transactions, and Spring Security — then a complete end-of-track synthesis. (9 posts — all live)

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4. Data & Messaging

SQL ORMs hide, Kafka with Java, the transactional outbox, caching, Spring Batch, and Kafka Streams concepts. (6 posts)

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5. Concurrency & JVM

Threads and locks, executors, virtual threads, CompletableFuture, GC, and production diagnosis with dumps and JFR. (6 posts)

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6. Production Java

Observability, config and secrets, resilience, safe deployments, load testing — ending in a production-ready capstone service. (6 posts)

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Coming from Python?

An alternate entry path for Python developers: the mental-model shift, types and generics, the JVM ecosystem, and IntelliJ tooling.

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