I tried to chew C # (polymorphism: polymorphism)

Output based on the basic Java of C # done in the past

Polymorphism: polymorphism

One of the convenient functions of a class is that you can put an instance of a derived class in a variable of the base class.

Supplement 1

I heard that there is a development group that only attaches finals and that MicroSoft made it.

namespace ShootingGame
{
    class Enemy
    {
        public int hp;
        public virtual void Move() // public abstract void Move()
        {
        }
    }
}

Supplement 2

Since the abstract that is also in Java is (unimplemented class), new cannot be done. It is important to "override and write the contents at the inherited destination"!

I feel that it is possible to access from anywhere because many merits can be inherited.

Based on

Enemy.cs

namespace ShootingGame
{
    class UFO:Enemy
    {
        public override void Move()
        {
            Console.WriteLine("Move in a zigzag");

        }
    }
}

Meteor.cs

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

namespace ShootingGame
{
    class Meteor:Enemy  //Create a Meteor class by inheriting the Enemy class
    {
        //Override the Move method of the Enemy class
        public override void Move()
        {
            Console.WriteLine("Move straight");
        }
    }
}

Star.cs

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

namespace ShootingGame
{
    class Star:Enemy
    {
        public override void Move()
        {
            Console.WriteLine("Move while rotating");

        }
    }
}

UFO.cs

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

namespace ShootingGame
{
    class UFO:Enemy
    {
        public override void Move()
        {
            Console.WriteLine("Move in a zigzag");

        }
    }
}

Program.cs

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

namespace ShootingGame
{
    class Program
    {
        static void Main(string[] args)
        {
            UFO ufo;
            Star[] stars = new Star[2];
            Meteor[] meteors = new Meteor[2];

            //Create an instance
            ufo = new UFO();
            stars[0] = new Star();
            stars[1] = new Star();
            meteors[0] = new Meteor();
            meteors[1] = new Meteor();

            //Move the enemy
            ufo.Move();
            for (int i = 0; i < stars.Length; i++)
            {
                stars[i].Move();
            }
            for (int i = 0; i < meteors.Length; i++)
            {
                meteors[i].Move();
            }
        }
    }
}

Recognize useful functions such as