*☕ Master Java :* The Java Tree 👇 | |── *Basics* | ├── Data Types (int, float, char, boolean) | ├── Variables & Constants | ├── Operators (Arithmetic, Logical, Relational) | └── Type Casting | |── *Control Structures* | ├── if / else / switch | ├── for / while / do-while loops | └── break / continue | |── *Object-Oriented Programming* | ├── Class & Object | ├── Constructor / Overloading | ├── Inheritance | ├── Polymorphism (Overriding) | ├── Abstraction (abstract class / interface) | └── Encapsulation (getters/setters) | |── *Arrays & Collections* | ├── 1D / 2D Arrays | ├── ArrayList / LinkedList | ├── HashMap / HashSet / TreeMap | └── Collections Methods (sort, reverse, etc.) | |── *Exception Handling* | ├── try / catch / finally | ├── throw / throws | └── Custom Exceptions | |── *String Handling* | ├── String / StringBuilder / StringBuffer | ├── Useful Methods (length, charAt, substring) | └── Regex (matches, replaceAll) | |── *Input & Output* | ├── Scanner / BufferedReader | ├── File Handling (File, FileWriter, BufferedReader) | └── Serialization | |── *Multithreading* | ├── Thread Class / Runnable Interface | ├── sleep(), join(), yield() | └── Synchronization / Locks ||── *Java 8+ Features* | ├── Lambda Expressions | ├── Streams API | ├── Functional Interfaces | └── Optional Class | |── *Java Memory Model* | ├── Stack & Heap | ├── Garbage Collection | └── Static vs Instance | |── *Access Modifiers* | ├── private / public / protected / default | └── final / static / transient / volatile | |── *Useful Libraries* | ├── java.util.*, java.io.*, java.time.* | └── Apache Commons, Gson, Jackson | |── *Build Tools & IDEs* | ├── Maven / Gradle | ├── IntelliJ / Eclipse | └── JDK / JRE Setup | |── *Best Practices* | ├── Clean Code (naming, readability) | ├── SOLID Principles | └── Unit Testing (JUnit) | |── END __ 💬 *Double Tap ❤️ for more!*