For testing, I have created a class named Vehicle that I made abstract since I don’t want to allow anyone to create instances of this class. Its only purpose is to exist so I can use my other classes, Car and Bicycle, to inherit from it.

Do I really need a constructor and getters and setters in my Vehicle class?

I have attached my code below to show what I have come up with so far. I know that I still need to implement proper validation for various things, and so on.

Vehicle.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ObjectsClasses
{
    //Create a super class named vehicle and set it to abstract because we do not allow anyone to create instances of this class
    abstract class Vehicle
    {
        //Properties
        private string name;
        private string color;
        private int year;
        private int wheels;

        //Constructor
        public Vehicle(string name, string color, int year, int wheels)
        {
            this.name = name;
            this.color = color;
            this.year = year;
            this.wheels = wheels;
        }

        // GETTERS & SETTERS

        public string Name
        {
         get { return name; }
         set { name = value; }
        }

        public string Color
        {
            get { return color; }
            set { color = value; }
        }

        public int Year
        {
            get { return year; }
            set {
             //Check if the value is over 50 years or in the future. If so, throw an error
             int thisYear = DateTime.Now.Year;
                int timeDifference = thisYear - value;
                if (timeDifference > 50 || value > thisYear)
                {
                    throw new ArgumentException("Error! The car can't have been made for over 50 years ago or in the future!");
                }
                else
                {
                    year = value;
                        }                 
            }
        }

        public int Wheels
        {
            get { return wheels; }
            //If wheels is set to under 2 or over 18, default it to 4 wheels using a ternary operator
            set { wheels = value < 2 || value > 18 ? 4 : value; }
        }

        //Methods
        public abstract void Honk(); //Every class that inherits from Vehicle must create it's own version of this method
    }

}

Car.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ObjectsClasses
{
    class Car : Vehicle
    {
        //Properties
        private string fuelType;
        public Car(string name, string fuelType, string color, int year, int wheels) : base(name, color, year, wheels)
        {
            this.fuelType = fuelType;
        }

        //Getters & Setters
        public string FuelType
        {
            get { return fuelType; }
            set { fuelType = value; }
        }

        //Methods

        //The method Honk inherits from it's parent class Vehicle but makes it's own version by using override
        public override void Honk() => Console.WriteLine("TUUUT, TUUUT, TUUUT!");

    }
}

Bicycle.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ObjectsClasses
{
    class Bicycle : Vehicle
    {
        //Properties
        private string material;

        //Constructor
        public Bicycle(string name, string color, string material, int wheels) : base(name, color, 0, wheels)
        {
            this.material = material;
        }

        //GETTER & SETTER

        public string Material
        {
            get { return material; }
            set { material = value; }
        }

        //Methods

        //The method Honk inherits from it's parent class Vehicle but makes it's own version by using override
        public override void Honk() => Console.WriteLine("PLING, PLING, PLING!");



    }
}