Software Development Exercises - UE10

📜 Tasks

This exercise focuses on exception handling, abstract classes, and interfaces. The tasks are divided into three main sections:

1. Exception Handling

Implement a program to read and display HTML content from a URL with proper exception handling:

• MalformedURLException: Retry until a valid URL is entered.
• IOException (openStream): Exit the program with an error message.
• IOException (read/close): Handle reading errors and ensure the input stream is closed in a finally block.

2. Throwing and Testing Exceptions

Develop a BankAccount system:

• Class Account:
  • Methods for withdraw and deposit with exception handling.
  • Exceptions:
    • IllegalArgumentException for invalid amounts.
    • Exception for overdrawing or exceeding €100,000.
• Class BankApp:
  • Test the Account class with various scenarios, ensuring expected exceptions are thrown and caught.

3. Abstract Classes and Interfaces: Vehicles

Develop a vehicle simulation with a hierarchical design:

Abstract Class Vehicle

• Fields: kind, drivenDistance, cumulativeCosts.
• Methods:
  • drive(double km): Updates distance and costs.
  • abstract double costPerKM(): To be implemented by subclasses.

Abstract Class Car (extends Vehicle)

• Fields: fuelPer100km.
• Methods:
  • costPerLiter(): Abstract method to calculate fuel cost.
  • costPerKM(): Implements the cost calculation for cars.

Subclasses of Car:

• DieselCar: Sets fuel cost to €1.70 per liter.
• GasolineCar: Sets fuel cost to €1.60 per liter.

Class Bike (extends Vehicle):

• Fixed cost of €0.80 per ride, regardless of distance.

Interfaces:

• Printable: Method void print() to display vehicle details.
• Repairable: Methods for repairs and maintenance.

Class VehicleApp:

• Test the vehicle hierarchy and methods using a predefined array of vehicles.

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📂 Project Structure

src/

• In.java Helper class for input
• Out.java Helper class for output
• DownloadHtmlExample.java Handles exception-based URL reading
• Account.java Implements bank account functionality
• BankApp.java Tests the Account class
• Vehicle.java Abstract base class for vehicles
• Car.java Abstract class for cars
• DieselCar.java Represents diesel-powered cars
• GasolineCar.java Represents gasoline-powered cars
• Bike.java Represents bicycles
• Printable.java Interface for displaying details
• Repairable.java Interface for repairs and maintenance
• VehicleApp.java Demonstrates vehicle functionalities

tests/

• Testprotokolle.txt Test cases and results for all tasks

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🛠 Tools

• Programming Language: Java
• Editor: Visual Studio Code with JavaWiz extension

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📝 License

This project is licensed under the MIT License.