创建car类

internal class car
{
    //定义字段
    public string name;
    public int speed;
    public int maxspeed;
    public double weight;

    public car(string name,int speed,int maxspeed,double weight) //构建函数
    {
        this.name = name;
        this.speed = speed;
        this.maxspeed = maxspeed;
        this.weight = weight;
    }

    //定义方法
    public void run() 
    {
        Console.WriteLine("跑");
    }
    public void stop() 
    {
        Console.WriteLine("停");
    }
    public void carshow() 
    {
        Console.WriteLine($"品牌：{name} 速度：{speed} 最大速度：{maxspeed} 重量：{weight}");
    }

}

主函数使用：

static void Main(string[] args)
{
        //car类使用
    car car1 = new car("五菱mini", 80, 120, 1500);
    car car2 = new car("小米SU7", 80, 180, 2500);
    car car3 = new car("大众", 100, 200, 3500);
    car2.run();
    Console.WriteLine($"{car2.name}启动");
    car2.stop();
    Console.WriteLine($"{car2.name}停车");
    car2.carshow();
}