Java Converter Application

A console-based Java application for performing various unit conversions and calculations such as currency, length, weight, speed, BMI, and grades. It provides a menu-driven interface for quick, interactive conversions.

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📂 Project Structure

src/main/java/se/lexicon/
├─ Main.java                 # Entry point
├─ Converter.java            # Conversion logic
├─ ConverterTool.java        # Converter categories
├─ ConversionOption.java     # Individual conversion options
├─ ConverterFormulas.java    # All mathematical formulas
├─ ConversionResult.java     # Holds result of a conversion
└─ Utility.java              # User input helpers and validation

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⚙️ Prerequisites

1. Java Development Kit (JDK)

     java -version

2. Maven (if you plan to build and run via Maven)

     mvn -version

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🛠 How to Run

Option 1: Run via IDE

1. Open the project in IntelliJ IDEA, Eclipse, or your preferred IDE
2. Run Main.java

Option 2: Run via Command Line

# Compile manually & Run
javac -d out src/main/java/se/lexicon/*.java
java -cp out se.lexicon.Main

Option 3: Run via Maven

mvn clean package
java -jar target/java-fundamentals2-workshop-1.1.jar

The converter menu will appear in the console where you can select different conversion options.

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📌 Converter Features

Unit Conversions

| Converter Type    | Units Supported      |
|-------------------|----------------------|
| Currency          | SEK ↔ USD, SEK ↔ EUR |
| Temperature       | Celsius ↔ Fahrenheit |
| Length            | Kilometers ↔ Meters  |
| Weight            | Kilograms ↔ Grams    |
| Time              | Hours ↔ Minutes      |
| Speed             | km/h ↔ m/s           |
| Fuel Consumption  | L/100km ↔ km/L       |
| Data Storage      | KB ↔ MB ↔ GB         |

Calculators

| Calculator Type   | Output               |
|-------------------|----------------------|
| BMI               | BMI. BMI Category    |
| Grade Converter   | Mark -> Grade (A-F)  |

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📦 Download & Run Prebuilt JAR

You can download the latest release from GitHub Releases.

Run it with:

  java -jar java-fundamentals2-workshop-1.1.jar

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⚡ Example output:

============= Converter App Menu ==============
1. Currency Converter – SEK ↔ USD, SEK ↔ EUR
2. Temperature Converter – Celsius ↔ Fahrenheit
3. Length Converter – Meters ↔ Kilometers
4. Weight Converter – Kilograms ↔ Grams
5. Time Converter – Hours ↔ Minutes
6. Speed Converter – km/h ↔ m/s
7. Fuel Consumption Converter – L/100km ↔ km/L
8. Data Storage Converter – KB ↔ MB ↔ GB
9. BMI Calculator – Compute BMI and category
10. Grade Converter – Percentage → Letter grade
11. Exit
================================================
Choose Option (1-11): 4
1. KG -> G
2. G -> KG
================================================
Choose Option (1-2) : 1
Enter Value in KG : 23.5
------------------------------------------------
Weight Converter – Kilograms ↔ Grams
------------------------------------------------
Result: 1 23.50 KG = 23500.00 G
Converted at: 2026-03-07 16:30
================================================
Press ENTER to continue...
What do you want to do next?
1. Repeat KG -> G Conversion
2. Return to Weight Converter – Kilograms ↔ Grams
3. Return to Main Menu
4. Exit
================================================
Choose Option (1-4): 1
Enter Value in KG : 4.5
------------------------------------------------
Weight Converter – Kilograms ↔ Grams
------------------------------------------------
Result: 0 4.50 KG = 4500.00 G
Converted at: 2026-03-07 16:31
================================================
Press ENTER to continue...

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