☕ Old Java Learning — Introduction to Java

Welcome to my Java learning repository!
This repo documents my journey through the fundamentals of Java programming, from basic syntax to mini hands-on projects.
Each lesson includes example code and exercises that gradually build up my understanding of core Java concepts.

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🎯 Objective

To gain a strong foundation in Java programming, covering variables, conditionals, input/output, math operations, and small interactive programs — all through hands-on coding examples.

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📚 Topics Covered

#	Timestamp	Topic	Description
1	00:00:00	Introduction to Java	Basic setup, structure of a Java program, and running the first “Hello World”.
2	00:10:58	Variables ❎	Understanding data types, declaration, initialization, and naming conventions.
3	00:31:30	User Input ⌨️	Taking input from users using the Scanner class.
4	00:47:25	⭐ Mad Libs Game 📕	A fun mini-project combining string concatenation and user input.
5	00:54:08	Arithmetic 🧮	Performing basic math operations and understanding operator precedence.
6	01:02:29	⭐ Shopping Cart Program 🛒	Simple calculator-style project simulating a basic checkout system.
7	01:09:00	If Statements 🤔	Conditional logic and branching in Java.
8	01:22:28	Random Numbers 🔀	Using the Random class to generate random values.
9	01:27:28	Math Class 📐	Exploring built-in math functions in Java.
10	01:42:37	Printf 🖨️	Formatted output using System.out.printf().
11	01:56:14	⭐ Compound Interest Calculator 💸	Real-world financial calculator using arithmetic and user input.
12	02:03:47	Nested If Statements 🎟️	Handling multiple layers of conditional checks.
13	02:10:20	String Methods 🧵	Using built-in methods to manipulate and analyze strings.
14	02:18:55	Substrings 📧	Extracting and combining parts of strings.
15	02:27:00	⭐ Weight Converter 🏋️	Mini-project converting weight between kilograms and pounds.
16	02:35:19	Ternary Operator ❔	Short-form conditional expressions in Java.
17	02:41:10	⭐ Temperature Converter 🌡️	Interactive project converting between Celsius and Fahrenheit.

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🧩 Highlights

• Hands-on exercises for each concept.
• ⭐ Mini projects after every few topics to reinforce learning.
• Focus on real-world logic and clean code structure.
• Beginner-friendly code with comments and examples.

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🛠️ Tools & Technologies

• Language: Java (JDK 21+)
• IDE: VS Code / IntelliJ IDEA
• Compiler: javac
• Runtime: Java Virtual Machine (JVM)

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🚀 How to Run

1. Clone the repository:

   git clone https://github.com/<your-username>/old-java-learning.git
   cd old-java-learning