Nearth===009/C#靜态構造函數,構造函數以及析構函數的學習

為定義的建築類（building類）添加一個表示對象總個數的靜态字段，編寫相應的靜态構造函數初始化靜态字段?

為定義的建築類添加構造函數（包括無參、有參構造函數）和析構函數?

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

namespace ly
{
    class Program
    {
        static void Main(string[] args)
        {
            
            Building build1 = new Building();
            Building build2 = new Building(18);
            Building build3 = new Building();
            Console.WriteLine("共有建築個數：{0}",Building.count1);
            Console.WriteLine("=============================");
            Circle c1 = new Circle();
            Circle c2 = new Circle(2);
            Console.WriteLine("共有圓的個數：{0}", Circle.count2);
            Console.WriteLine("=============================");
            Cat cat1 = new Cat();
            Cat cat2 = new Cat(18);
            Console.WriteLine("貓的個數：{0}", Cat.count);
            Console.Read();
        }
    }
    class Building
    {
        public string address;
        public int floors;
        public string buildTime;
        public int age;
        public string owers;
        public static int count1;
        public Building(){
            count1++; 
        }
        public static int set(int count1) {
            return count1;
        }
        public Building(int age) {
            count1++;
        }
        public Building(string address, int floors,string buildTime)
        {
            this.address = address;
            this.floors = floors;
            this.buildTime = buildTime;
        }
        ~Building() {
            count1--;
        }
    }
    class Circle
    {
        public int r;
        public static int count2;
        public Circle(){
            count2++;
        }
        public Circle(int r){
            count2++;
        }
        ~Circle() {
            count2--;
        }
      
    }
    public class Cat
    {
        string name;
        string sex;
        int age;
        public static int count;
        public Cat()
        {
            count++;
        }
        public Cat(int age)
        {
            count++;
        }
        ~Cat() {
            count--;
        }
    }
}      

反正一天不學習身體就難受···························