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Java Study Plan 2025: Where to Start Learning from Scratch

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Java Study Plan 2025: Where to Start Learning from Scratch



Java remains one of the most in-demand programming languages in the world. In 2025, it still holds leading positions in enterprise development, Android applications, and high-load systems. If you have decided to master Java from scratch, it is important not just to study the syntax, but to follow a structured plan. Below is the optimal roadmap for beginners.



Stage 1: Basics of Syntax and Tooling

Start by installing the JDK (version 17 or 21 LTS) and IntelliJ IDEA Community Edition. Dedicate the first two weeks to basic topics:

  • Data types, variables, operators
  • Conditional constructs (if, switch) and loops (for, while)
  • Arrays and working with strings
  • Methods: parameters, return values, overloading

Practice on tasks from Codewars or LeetCode at the Easy level.



Stage 2: Object-Oriented Programming (OOP)

Java is first and foremost an OOP language. A deep understanding of these concepts is essential:

  • Classes and objects, constructors
  • Encapsulation (access modifiers, getters/setters)
  • Inheritance and polymorphism
  • Abstract classes and interfaces

Try writing a small game (e.g., "Tic-Tac-Toe" or "Bank Account") to solidify the material.



Stage 3: Collections and Exceptions

After OOP, move on to standard data structures and error handling:

  • List, Set, Map (especially HashMap and ArrayList)
  • Generics — a mandatory topic
  • Exception handling: try-catch-finally, checked vs unchecked

At this stage, it is useful to solve problems involving sorting, searching, and filtering data.



Stage 4: Working with Files and Streams (I/O)

Learn to read and write data:

  • FileInputStream, FileOutputStream, BufferedReader
  • Object serialization
  • Basics of working with dates (LocalDate, DateTimeFormatter)

Create a simple console diary application for saving notes to a file.



Stage 5: Tools and Ecosystem

To become a sought-after developer, add to your toolkit:

  • Build system: Maven or Gradle (choose Maven to start)
  • Databases: SQL (SELECT, JOIN, CRUD operations) + JDBC
  • Testing: JUnit 5 — write simple tests
  • Git: basic commands (commit, push, pull) and working with GitHub


Stage 6: First Project and Frameworks

Once the foundation is ready, move on to web development. For Java in 2025, the standard is Spring Boot: