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Java

10 topics · AI-enhanced lessons

Enterprise-grade, platform-independent. Dominates Android and large-scale backends.

📚 Sources:Oracle Java Docs·99%Javatpoint·88%W3Schools Java·90%
🟢 Beginner
4 topics
01

Introduction to Java

JVM, JDK, JRE, first Hello World

02

Data Types & Variables

Primitives, wrapper classes, type casting

03

Control Flow

if/else, switch, for, while, do-while

04

Arrays

1D/2D arrays, enhanced for, Arrays class

🟡 Intermediate
4 topics
01

OOP Concepts

Classes, objects, constructors, this keyword

02

Inheritance & Polymorphism

extends, super, override, abstract, interface

03

Exception Handling

try/catch/finally, custom exceptions, throws

04

Collections Framework

ArrayList, HashMap, HashSet, LinkedList

🔴 Advanced
2 topics
01

Java Streams & Lambdas

Stream API, filter/map/reduce, method refs

02

Multithreading

Thread, Runnable, synchronized, ExecutorService

Back to all languages

📊 Progress

Beginner4 topics
Intermediate4 topics
Advanced2 topics

🌐 Other Languages

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