Java Unit Converter

A clean and intuitive Java Swing desktop unit converter for volume, length, and temperature conversion, featuring real-time calculations and a simple GUI. It supports common measurement units in a lightweight Java Swing desktop interface.

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🚀 Overview

Java Unit Converter is a lightweight desktop tool built with pure Java Swing that allows users to convert between common units instantly.
It focuses on clarity, correctness, and ease of use, without external dependencies.

✔ Real-time bidirectional conversion
✔ Simple tab-based UI
✔ Custom typography using open-source fonts
✔ No libraries, no frameworks — just Java

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🖥 Demo & Interface

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✨ Features

📦 Volume Conversion

Convert between 13 volume units:

• Gallons, Quarts, Pints
• U.S. Cups, Tablespoons, Teaspoons
• Cubic Inches, Feet, Yards
• Liters, Milliliters
• Cubic Meters, Cubic Centimeters

📏 Length Conversion

Convert between 8 length units:

• Miles, Yards, Feet, Inches
• Meters, Kilometers, Centimeters
• Nautical Miles

🌡 Temperature Conversion

Convert between 3 temperature scales:

• Fahrenheit
• Celsius
• Kelvin

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⚡ How It Works

1. Select a conversion category
   Choose Volume, Length, or Temperature using tabs.

2. Generate a conversion box

   • Select a source unit
   • Select a target unit
   • Click Generate Conversion

   Identical unit selections are blocked with a clear error message.

3. Convert in real time

   • Enter a value in either field
   • The converted value updates instantly
   • Supports decimals and negatives
     (- alone is treated as -1 for convenience)

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🛠 Installation & Running

Requirements

• Java Development Kit (JDK) 8+
• No external dependencies

Project Structure

Java-unit-converter/
├── App.java
├── fonts/
│   ├── NotoSans-Regular.ttf
│   ├── NotoSans-Bold.ttf
│   └── EBGaramond-Regular.ttf
└── font_licenses/
    ├── OFL-Noto_Sans.txt
    └── OFL-EB_Garamond.txt

Compile & Run

javac *.java
java App

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🧪 Troubleshooting

Fonts not loading?

• Ensure fonts/ exists and filenames match those in App.java
• Check file read permissions (especially on Linux/macOS)

Classpath errors?

javac -cp . *.java
java -cp . App

UI looks incorrect?

• Check console logs for font loading errors
• Verify font paths are correct

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🔤 Font Attribution

This project uses fonts licensed under the SIL Open Font License (OFL).

EB Garamond

• Author: Georg Duffner
• Source: https://github.com/octaviopardo/EBGaramond12
• License: font_licenses/OFL-EB_Garamond.txt

Noto Sans

• Author: Google Inc.
• Source: https://github.com/notofonts/latin-greek-cyrillic
• License: font_licenses/OFL-Noto_Sans.txt

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📜 License Compliance

This project complies with Apache License 2.0 and SIL OFL by:

1. Including unmodified font files
2. Bundling full license texts
3. Preserving copyright notices
4. Not redistributing fonts independently
5. Providing clear attribution

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🤝 Contributing

Contributions, bug reports, and suggestions are welcome.
If you find this project useful, please consider starring ⭐ the repository — it helps others discover it.

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© 2025 richie-rich90454