unity游戏开发-C#语言基础篇（面向对象-多态_虚函数带参和不带参构造函数）

    class Program
    {
        static void Main(string[] args)
        {
            //有一个交通工具类Vehicle，将它作为基类派生小车类Car、卡车类Truck和轮船类Boat，定义这些类并定义一个虚函数用来显示各类信息。



            Vehicle vehicle = new Vehicle("交通工具", 8, 8);
            Truck truck = new Truck("东风", 18, 18);
            Car car = new Car("小汽车", 28, 28);
            Boat boat = new Boat("轮船", 38, 38);
            truck.ShowMsg();
            car.ShowMsg();
            boat.ShowMsg();
            vehicle.ShowMsg();

         

        }
    }

    class Boat:Vehicle
    {
        public Boat(string _name, int _jiage, int _speed)
            : base(_name, _jiage, _speed)
        {

        }
        public override void ShowMsg()
        {
            Console.WriteLine("轮船{0}，价格{1}，速度{2}", Name, Jiage, Speed);
        } 
    }

   class Car:Vehicle
    {
        public Car(string _name, int _jiage, int _speed)
            : base(_name, _jiage, _speed)//base 有参数就执行父类的有参数构造函数 没有就默认执行父类没有参数的构造函数
        {

        }
        public override void ShowMsg()
        {
            Console.WriteLine("汽车{0}，价格{1}，速度{2}", Name, Jiage, Speed);
        }
    }

  class Truck:Vehicle
    {
        public Truck(string _name, int _jiage, int _speed)
            : base()
        {
            this.Name = _name;
            this.Jiage = _jiage;
            this.Speed = _speed;
        }
        public Truck(string _name, int _jiage, int _speed)
            : base(_name, _jiage, _speed)
        {

        }

        public override void ShowMsg()
        {
            Console.WriteLine("卡车{0}，价格{1}，速度{2}", this.Name, this.Jiage, this.Speed);
        }
    }

 class Vehicle
    {
        private string name = "1";
        private int jiage;
        private int speed;

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


        public int Jiage
        {
            get { return jiage; }
            set
            {
                if (value > 0)
                {
                    jiage = value;

                }
                else
                {
                    Console.WriteLine("价格有误！");
                }
            }
        }


        public int Speed
        {
            get { return speed; }
            set { speed = value; }
        }

        public Vehicle(string _name, int _jiage, int _speed)
        {

            this.name = _name;
            this.jiage = _jiage;
            this.speed = _speed;

        }

        public Vehicle()
        {
            this.ShowMsg();
        }


        public virtual void ShowMsg()
        {
            Console.WriteLine("交通工具{0}，售价{1}，速度{2}", Name, Jiage, Speed);

        }


    }