W3Schools – Java Tutorial
Straightforward, browser-based tutorial. You can try code right in the browser (“Try it Yourself”) so it's good for practicing as you go. W3Schools-
Covers basics: syntax, variables, loops, OOP.
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Free to use.
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Great to start and get comfortable with Java writing and running.
GeeksforGeeks – Java Tutorial & Practice
A large library of free reading materials + exercises (from basics to advanced). GeeksforGeeks
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Good for supplementing what you are learning and for practising quiz/exercise style.
JAVA DEVELOPER PROPER ROADMAP - 60 Days - PER DAY - 3 HOURS MIN
( 1 Hr - Concept Learning, 2 Hr - Problem Solving, Projects )
PHASE 1: Core Java Foundation (Days 1–20)
- Install JDK and IDE (IntelliJ / VS Code)
- Learn Variables and Data Types
- Learn Operators (Arithmetic, Logical, Comparison)
- Learn Input and Output using Scanner
- Learn Conditional Statements (if, else if, else, switch)
- Learn Loops (for, while, do-while)
- Practice Basic Pattern Programs (stars, numbers)
- Learn Arrays (creation, traversal, max/min search)
- Learn Strings (length, substring, comparisons)
- Learn Methods (function creation, returning values)
- Learn Classes and Objects (your first OOP concept)
- Learn Constructors (default, parameterized)
- Learn Encapsulation (private variables + getters/setters)
- Learn Inheritance (parent-child classes)
- Learn Polymorphism (overloading, overriding)
- Learn Abstraction (interface and abstract classes)
- Learn Static and Final keywords
- Learn Exception Handling (try, catch, finally)
- Do practice programs combining all topics
- Build Mini Project: Library Management System (Console-Based)
PHASE 2: Collections + Logic Building (Days 21–30) 21. Learn ArrayList
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Learn LinkedList
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Learn HashSet
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Learn HashMap
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Learn Stack and Queue
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Learn Sorting Objects using Comparator and Comparable
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Solve basic DSA problems on Arrays (sum, search, reverse)
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Solve DSA problems on Strings (count, palindrome, frequency)
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Solve DSA problems using HashMap (frequency count, duplicates)
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Build Mini Project: Student Result Management System
PHASE 3: Database + JDBC (Days 31–37) 31. Install MySQL or PostgreSQL
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Learn SQL commands: SELECT, INSERT, UPDATE, DELETE
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Learn Constraints and Joins
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Connect Java to Database using JDBC
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Insert data from Java to Database using PreparedStatement
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Perform full CRUD operations using JDBC
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Build Mini Project: Employee Management System (Console + DB)
PHASE 4: Spring Boot Backend Development (Days 38–55) 38. Install & Set Up Spring Boot Project
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Understand Project Structure (Controller, Service, Repository)
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Learn REST API Basics and create your first API
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Learn Spring Boot + JPA + Hibernate for DB Interaction
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Create Entity & Repository classes
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Implement CRUD APIs (GET, POST, PUT, DELETE)
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Test APIs using Postman
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Learn DTO and Model Mapping (clean response structure)
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Learn Validation and Custom Exception Handling
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Learn Dependency Injection (Service layer logic)
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Learn JWT Authentication (Login / Signup Security)
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Implement User Authentication API
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Add Pagination and Sorting in APIs
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Create Project 1: Todo REST API
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Create Project 2: User Authentication System
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Create Project 3: E-Commerce Backend (Products + Cart + Order)
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Add documentation using Swagger
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Clean up code and optimize folder structure
PHASE 5: Testing + Documentation (Days 56–58) 56. Test all APIs using Postman and store results
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Write basic Unit Tests using JUnit
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Add Swagger API Documentation to Project
PHASE 6: Deployment + Job Preparation (Days 59–60) 59. Push all code to GitHub and Deploy Backend to Render / Railway
- Update Resume + LinkedIn + Prepare for Mock Interviews
Tell your story clearly: Skills + Projects + GitHub + Deployment Link
Final Output (After Completion)
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You know Java Core & OOP clearly
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You know Collections & Problem Solving
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You can work with Databases
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You can build Real REST APIs
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You have 3–5 real portfolio backend projects
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You can show your work on GitHub + LinkedIn
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You are Job Ready Java Backend Developer
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