Object Oriented Programming Examples

C# - example

/// <summary>
/// Base class that Generalizes Vehicles.
/// </summary>
public class Vehicle {
  /// <summary>
  /// Every vehicle has an Identification Number.
  /// </summary>
  protected string VIN { get; set; }
  
  /// <summary>
  /// Every vehicle has a make.
  /// </summary>
  protected string Make { get; set; }
  
  /// <summary>
  /// Every vehicle has a model.
  /// </summary>
  protected string Model { get; set; }
}

/// <summary>
/// A specialization of Vehicle -- the TRUCK
/// </summary>
public class Truck : Vehicle {
  /// <summary>
  /// Classes of trucks are defined by towing capacity.
  /// </summary>
  public int TowingCapacity { get; set; }
  
  /// <summary>
  /// These are the protected attributes of Vehicle.
  /// </summary>
  public string Make {
    get { return base.Make; }
    set { base.Make = value; }
  }

  public string Model {
    get { return base.Model; }
    set { base.Model = value; }
  }

  public string VIN {
    get { return base.VIN; }
    set { base.VIN = value; }
  }
}

/// <summary>
/// A specialization of Vehicle -- The CAR.
/// </summary>
public class Car : Vehicle {
  /// <summary>
  /// Not sure why someone wanted the car smell included -- but here it is!
  /// </summary>
  private string Smell;

  /// <summary>
  /// These are the protected attributes of Vehicle.
  /// </summary>
  public string Make {
    get { return base.Make; }
    set { base.Make = value; }
  }

  public string Model {
    get { return base.Model; }
    set { base.Model = value; }
  }

  public string VIN {
    get { return base.VIN;  }
    set { base.VIN = value; }
  }
}

inheritance

Vehicle() {
  var color;
  var has_engine = null;
  vehicle() {
    this.color = 'blue';
  }
}

Car() extends Vehicle {
  var num_wheels;
  car() {
    this.num_wheels = 4;
  }
}

Bike() extends Vehicle {
  var num_wheels;
  bike() {
    this.num_wheels = 2;
  }
  bike(num_wheels) {
    // What if we want 3 wheels?
    this.num_wheels = num_wheels;
  }
}

var my_bike = new Bike();

var tricycle = new Bike(3);

var my_car = new Car();