A chapter-wise Java learning repository with beginner to advanced examples, practice files, mini-projects, and algorithm drills.
Open a chapter file • Read comments and flow • Edit and iterate
- Main source folder: src
- JavaDocs entry point: MyJavaDocs/index.html
- Advanced Java section: src/AdvancedJava
- Basic practice section: src/Basic_Java_Practice
- Sorting section: src/Sorting
| Track | Why it matters | Open |
|---|---|---|
| Advanced Java | Collections, Generics, Date/Time, and deeper Java APIs | Go to AdvancedJava |
| Sorting | Core algorithm thinking and array manipulation practice | Go to Sorting |
src/
Ch01_... to Ch14_... # Chapter-wise core Java progression
AdvancedJava/ # Collections, Generics, Date/Time, etc.
Basic_Java_Practice/ # Beginner-focused practice problems
Ch12_Packages/ # Package examples
Personal_Practice/ # Personal experiments
Sorting/ # Algorithm implementations
MyJavaDocs/ # Generated JavaDocs
| Chapter | Topic | Start File |
|---|---|---|
| 01 | Java Basics | Ch01_01_Main.java |
| 01.5 | ⭐ Memory Fundamentals | Ch01_02_IntroToMemories.java |
| 02 | Operators | Ch02_07_Operators.java |
| 03 | Strings | Ch03_13_Strings.java |
| 04 | Conditionals & Switch | Ch04_17_Conditionals.java |
| 05 | Loops | Ch05_23_Loops.java |
| 06 | Arrays | Ch06_27_Arrays.java |
| 07 | Methods & Recursion | Ch07_31_Methods.java |
| 08 | OOP Basics | Ch08_37_OOPs_Imp.java |
| 09 | Access & Constructors | Ch09_40_AccessModifiers.java |
| 10 | Inheritance | Ch10_44_Inheritance.java |
| 11 | Abstraction & Interfaces | Ch11_53_AbstractClass.java |
| 12 | JVM & Packages | Ch12_62_Interpreter_n_Compiler.java |
| 13 | Multithreading | Ch13_71_MultiThreading.java |
| 14 | Exceptions | Ch14_81_ErrorsinJava.java |
This is the diamond of the Gold Java Repo!
This foundational file is critical to understanding how Java works. It covers:
- Stack vs Heap Memory - The backbone of Java memory management
- Pass by Value concept - With genius-level analogies (seriously, the photocopy & treasure map explanations are gold!)
- Primitive vs Reference types - Why changing one variable doesn't affect another
- Object references - Understanding how objects in heap memory work
Why it matters: Without a solid grasp of stack/heap memory, you'll be confused about why certain operations work the way they do. This file demystifies the magic!
Recommendation: Read this early and revisit it before diving into OOP, Collections, or anything involving object manipulation.
- Rock Paper Scissors: Ch04_22_RPSGame.java
- Guess The Number: Ch09_42_GuessTheNumber.java
- Online Library: Ch10_49_OnlineLibrary.java
- Online Showroom: Ch10_50_OnlineShowroom.java
- Custom Calculator: Ch14_91_CustomCalculator.java
- Selection Sort: S02_SelectionSort.java
- Array operations practice: Ch06_28_Array_Operations.java
- Important array practice set: Ch06_30_Practice11_Imp.java
If you want to quickly build practical Java confidence, start with:
src/Sorting/S02_SelectionSort.java
src/AdvancedJava
src/Ch10_49_OnlineLibrary.java
- File names are chapter-prefixed (
ChXX_...) to keep learning order clear. - Many files contain multiple small examples in comments; edit and rerun for best learning.
- JavaDocs can be opened directly from MyJavaDocs/index.html.
