Java

Core Java from JVM fundamentals to production-ready code. OOP, generics, collections, streams, concurrency, testing, and modern Java features (records, sealed classes, pattern matching).

BeginnerTopics 1–12

·Java Platform & JVM
·Variables & Primitive Types
·Operators & Type Casting
·Control Flow
·Loops
·Arrays
·Methods & Overloading
·Classes & Objects
·Constructors & this
·Inheritance & super
·Interfaces & Abstract Classes
·Packages & Imports

Start Beginner →

IntermediateTopics 13–26

·Encapsulation & Access Modifiers
·Polymorphism
·Enums
·Generics
·Collections Framework
·List, Set, Map
·Exception Handling
·Checked vs Unchecked Exceptions
·Try-with-Resources
·String & StringBuilder
·File I/O with NIO.2
·Functional Interfaces & Lambdas
·Optional
·Iterator & Iterable

Start Intermediate →

AdvancedTopics 27–40

·Streams API
·Optional Chaining & Collectors
·Concurrency Basics
·Executor Framework
·CompletableFuture
·Virtual Threads
·synchronized & volatile
·Locks & Atomic Variables
·Java Memory Model
·Annotations & Reflection
·JVM Memory & Garbage Collection
·Design Patterns in Java
·Sealed Classes & Pattern Matching
·Records & Value-Based Classes

Start Advanced →

ProductionTopics 41–50

·JUnit 5
·Mockito
·Maven & Gradle
·Logging with SLF4J & Logback
·Configuration & Properties
·Docker for Java
·JVM Tuning
·Java Modules (JPMS)
·HTTP Client & REST
·Performance Profiling

Start Production →