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Programming language guide

Learn Java

Learn Java through a practical sequence of fundamentals, projects, debugging, and career-ready skills.

Best for

  • Backend services and enterprise applications
  • Android-adjacent JVM knowledge
  • Strongly typed object-oriented programming

Prerequisites

  • Basic programming concepts are helpful but not required
  • Install a supported JDK
  • Learn command-line compilation or use an IDE with a clear project structure

Learning sequence

Recommended Learning Order

  1. 1

    Stage 1

    JDK, source files, types, control flow, and methods

  2. 2

    Stage 2

    Classes, interfaces, inheritance, records, and exceptions

  3. 3

    Stage 3

    Collections, generics, streams, and file I/O

  4. 4

    Stage 4

    Testing, build tools, concurrency, and JVM basics

  5. 5

    Stage 5

    Spring Boot or another application framework after core Java

Study Timeline

3 hours/week

Work through core syntax and OOP with console projects.

6 hours/week

Add collections, testing, build tools, and database access.

10 hours/week

Progress into a service project and Spring Boot.

Project Progression

Beginner: console inventory manager

Intermediate: tested file-backed or database-backed application

Portfolio: Spring Boot REST service with persistence and validation

Common Mistakes

  • Using inheritance where composition is simpler
  • Ignoring equals/hashCode behavior in collections
  • Catching exceptions without handling or propagating them meaningfully
  • Learning framework annotations without understanding Java classes, interfaces, and dependency management

Job-Ready Skills

  • Core Java and collections
  • OOP and interfaces
  • Testing
  • Maven or Gradle
  • SQL
  • Spring Boot and HTTP services

Frequently Asked Questions

Should I learn Java before Spring Boot?

Yes. Be comfortable with classes, interfaces, exceptions, collections, generics, and build tools before learning Spring dependency injection and web annotations.

Do I need to understand the JVM?

You do not need internals first, but basic knowledge of compilation, bytecode, memory, and JVM options becomes important for debugging and production work.