Java Fundamentals — Java + Spring Boot Roadmap

The core language that Spring Boot applications are built with

Steps in Java Fundamentals

Java Syntax & Setup — beginner · Installing the JDK, writing and running your first Java program
Variables, Data Types & Operators — beginner · Primitive types, reference types, type casting and operators
Control Flow — beginner · if/else, switch, for/while loops and enhanced for-loops
Methods & Parameters — beginner · Defining methods, overloading, varargs and pass-by-value semantics
Object-Oriented Programming Basics — beginner · Classes, objects, constructors and the this keyword
Inheritance & Polymorphism — beginner · Extending classes, method overriding and runtime polymorphism
Interfaces & Abstract Classes — beginner · Defining contracts with interfaces and partial implementations with abstract classes
Encapsulation & Access Modifiers — beginner · public/private/protected, getters/setters and designing a clean public API
Collections Framework — beginner · List, Set, Map implementations and choosing the right collection
Generics — beginner · Writing type-safe, reusable classes and methods with generics
Exception Handling — beginner · Checked vs unchecked exceptions, try/catch/finally and custom exceptions
Lambda Expressions & Functional Interfaces — beginner · Writing concise functional-style code with lambdas and interfaces like Function and Predicate
Streams API — beginner · Processing collections declaratively with map, filter, reduce and collectors