🚚 Shipping Company (Java OOP – Console App)

A Java console application that simulates shipping liquid and gas products from Hamburg Port (Germany) to major European cities.
The program computes volume, weight, best truck combination, and total shipping cost (including return trip) and is fully developed using Object-Oriented Programming (OOP) principles.

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📌 What it does

• Create/select items (with density & risk factor)
• Add orders (product, gallons, destination city)
• Convert gallons ↔ m³, compute total weight
• Pick the best tanker truck combination automatically (small/medium/large)
• Calculate final price: distance-based cost + risk factor + empty return to Hamburg
• Print detailed summaries for items and orders

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🛢️ Supported Liquids & Risk Factors

• Oxygen (O₂) – 17%
• Hydrogen (H₂) – 18%
• Nitrogen (N₂) – 2%
• Propene – 20%
• Carbon Dioxide (CO₂) – 10%
• Methane – 18%
• Benzene (E95) – 20%
• Benzene (Super) – 20%
• Water – 0%
• Milk – 0%

Densities are stored per product and used to compute total weight.

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🚛 Tanker Trucks (cylindrical containers)

• Small: Length 300 in, Radius 24 in
• Medium: Length 380 in, Radius 40 in
• Large: Length 860 in, Radius 52 in

The app computes container volume = π·r²·h (inches → gallons) and selects the cheapest valid combination.

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🌍 Cities (from Hamburg)

Berlin · Munich · Leipzig · Dresden · Köln · Rome · Paris · Wien · Madrid

More cities can be added by extending the distance table.

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📦 Packages & Key Classes

• calculation/
Calculation.java (core logic), Order.java, VolumeConverter.java, VolumeConvertible.java
• distance/
Cities.java, ShippingCity.java (names & distances from Hamburg)
• info/
Info.java (author, student id, group, creation date, total lines)
• liquide/
Item.java, ItemCatalog.java (name, density, risk, quantityGallon)
• tanks/
Truck.java, SmallTruck.java, MediumTruck.java, LargeTruck.java
• main/
ShippingApp.java (menu flow, input/validation), Main.java (entry point)

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🧭 Main Menu & Validation

WELCOME TO THE SHIPPING COMPANY APPLICATION..

=========== SHIPPING COMPANY MENU ===========

• 1- Show All Items
• 2- Show All Cities
• 3- Create New Order
• 4- Show All Orders
• 5- Add A New City
• 6- Show All Trucks
• 0- Exit

Your choice:-

Validation: non-numeric or out-of-range inputs are rejected with clear messages.

• Create New Order: product & city are verified, gallons must be ≥ 0.
• Best trucks: chosen by total volume; multiple trucks can be combined.
• Cost: base €/km/gal + risk%; empty return to Hamburg costs €0.6/km and is included.

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📜 License

This project is licensed under the MIT License.
See the LICENSE file for details.