Java 30 Day Challenge-tutorial
Welcome to your 30-day Java learning path!
This roadmap breaks Java into manageable daily topics with theory, coding exercises, video lessons, and interview practice. Follow it step by step to build a strong foundation, improve problem-solving skills, and prepare for interviews.
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| Day | Topic | Video | Prep-Zone |
|---|---|---|---|
| 1 | Introduction to Java, Setup (JDK, IDE), Hello World | Watch | Exercise Interview |
| 2 | Java Basics – Variables, Data Types, Operators | ||
| 3 | Control Statements – if, switch | Watch | Exercise Interview |
| 4 | Loops – for, while, do-while | Watch | Exercise Interview |
| 5 | Input/Output with Scanner & System.in/out | Watch | - |
| 6 | Methods (Functions) – Declaration, Parameters, Return | Watch | Exercise Interview |
| 7 | Method Overloading, Recursion | Watch | Exercise Interview |
| 8 | Arrays – 1D and 2D | Watch | Exercise |
| 9 | Strings – Class, Methods, Immutable, StringBuilder | Watch Watch | Exercise |
| 10 | Object-Oriented Programming – Classes and Objects | Watch | Exercise |
| 11 | Constructors, ‘this’ Keyword | Watch | - |
| 12 | Inheritance – Super, Method Overriding | Watch | Exercise Interview |
| 13 | Polymorphism – Compile-time & Runtime | Watch | Exercise Interview |
| 14 | Abstraction – Abstract Classes and Interfaces | Watch | Exercise Interview |
| 15 | Encapsulation – Access Modifiers, Getters/Setters | Watch | Exercise Interview |
| 16 | Static Keyword, Blocks, Static vs Instance Members | Watch Watch | Interview |
| 17 | Inner Classes and Anonymous Classes | Watch | - |
| 18 | Exception Handling – try, catch, finally, throw, throws | Watch Watch | Exercise Interview |
| 19 | Java Collections – List, ArrayList, LinkedList | Watch Watch | Exercise Interview |
| 20 | Set, HashSet, TreeSet | Watch | Exercise Interview |
| 21 | Map Overview, HashMap, TreeMap, Iterators | Watch Watch Watch | Exercise |
| 22 | Wrapper Classes, Autoboxing/Unboxing | Watch | Exercise |
| 23 | Enum, varargs, and Enhanced for-loop | Watch Watch Watch | Exercise Interview |
| 24 | File Handling – FileReader, FileWriter, Buffered I/O | Watch Watch | - |
| 25 | Multithreading – Thread Class, Runnable Interface | Watch Watch | Exercise Interview |
| 26 | Thread Lifecycle, Synchronization | Watch Watch | - |
| 27 | Lambda Expressions and Functional Interfaces | Available soon | - |
| 28 | Java 8 Features – Stream API Basics | Available soon | - |
| 29 | Interview Questions / Real-World Practice Problems | Available soon | - |
| 30 | Final Project (Console-based Java App or Mini Quiz App) | Available soon | - |