Java From Scratch With DSA

Hands-on Java and DSA practice through small, single-topic programs.

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🔍 What You'll Learn

• Syntax and operators
• Control flow (if/else, loops)
• Methods and parameter passing
• OOP essentials (classes, objects, inheritance, interfaces, abstract classes)
• Collections basics (arrays, ArrayList, Vector, Stack)
• Exception handling and basic I/O
• Recursion and pattern-printing exercises

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💻 Technologies & Tools

• Java (JDK)
• Any IDE or text editor (e.g. IntelliJ IDEA, Eclipse, VS Code)
• Command line / Terminal

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🚀 Getting Started

1. Clone the repository:

   git clone https://github.com/debug-node/Java-from-scratch.git

2. Navigate into the project folder:

   cd Java-from-scratch

3. Compile and run Java files. For example:

   javac Main.java
   java Main

4. To run any default-package file (swap path/class):

   cd folder/with/file
   javac File.java
   java File

   Or from repo root into a shared output folder:

   javac -d out folder/with/file/File.java
   java -cp out File

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📁 Project Structure (current + future)

Java-from-scratch/
 ├─ arrays/
 │   ├─ array/
 │   └─ arraylist/
 ├─ basic/
 │   ├─ Operator/
 │   ├─ condition/
 │   ├─ loops/
 │   ├─ function/
 │   └─ simple/
 ├─ patterns/
 ├─ recursion/
 ├─ string/
 ├─ exception/
 ├─ OOPs/
 │   ├─ Abstractclass/
 │   ├─ CaloriesCalculator/
 │   ├─ grades/
 │   ├─ Inheritance/
 │   └─ interfaceclass/
 ├─ Assignment/
 ├─ mypack/
 └─ (add topics as needed: graphs/, streams/, concurrency/, jdbc/, collections-advanced/, algorithms/, ds/, tests/, scripts/)

Tip: View the live tree anytime (Windows):

tree /A /F

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✅ How to Contribute / Use It

• Try writing small Java programs using concepts learned

• Feel free to add your own examples or exercises

• If you find bugs or improvements, submit pull requests

• Optional: add helper scripts in scripts/ (e.g., compile/run by filename) to keep topic folders clean

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Badges

• JDK 17+
• PRs welcome

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🧑‍💻 Author

• debug-node