☕ Core Java
Foundational concepts required for every Java developer.OOP Concepts
Classes, Objects, Inheritance, Polymorphism, Abstraction, Encapsulation.
Exception Handling
Try-catch, finally, throw vs throws, custom exceptions.
String Handling
Understanding String immutability, the String Pool, StringBuilder, and StringBuffer.
📚 Java Collections
Data structures and utilities for managing groups of objects.Collections Framework
List, Set, Map, Queue, Deque interfaces and implementations.
Generics
Type parameters, bounded types, wildcards.
Streams API
Functional programming, map, filter, reduce, collectors.
🚀 Advanced Topics
In-depth concepts for experienced Java developers.Concurrency
Threads, Synchronization, Executors, Concurrent Collections.
Multithreading
Thread Lifecycle, Runnable, Callable, Thread Pools.
Java Memory Model
Heap vs Stack, Object Lifecycle, Memory Leaks.
🛠️ Patterns
A collection of proven solutions for architecture, enterprise systems, and algorithmic problem solving.Design Patterns
Creational, Structural, and Behavioral patterns (Singleton, Factory, Observer).
J2EE Patterns
Enterprise architectures like MVC, DAO, DTO, and Front Controller.
Algorithm Patterns
Interview strategies like Sliding Window, Two Pointers, and Merge Intervals.