构造函数学习

 1 /*
 * Created by SharpDevelop.
 * User: My little flower basket
 * Date: 2013/7/11
 * Time: 9:38
 * 
 * 构造函数特性
 * 不要构建两个相互调用的构造函数，这是错误的
 */
using System;

namespace oop
{
    public class  MyBaseClass
    {
        public MyBaseClass()
        {
            Console.WriteLine("我是MyBaseClass 1");
        }
        
        public MyBaseClass(int i )
        {
            Console.WriteLine("我是MyBaseClass 2");
            Console.WriteLine("我是MyBaseClass 2 我的值是："+i);
        }
    }
    
    
    public class MyDerivedClass : MyBaseClass//基类的可访问权限应该比子类要高
    {
        public MyDerivedClass() : this(5,6)//在使用指定的构造函数之前 先使用this
        {
            Console.WriteLine("MyDerivedClass 1");
        }
        
        public MyDerivedClass(int i)
        {
            Console.WriteLine("MyDerivedClass 2");
        }
        
        public MyDerivedClass(int  i  , int j):base(i)//这个i就是参数i的值
        {
            Console.WriteLine("MyDerivedClass 3 我是"+ i);
            Console.WriteLine("MyDerivedClass 3 我是" + j);
            Console.WriteLine("MyDerivedClass 3");
            
        }
    }
    
    
    class Program
    {
        public static void Main(string[] args)
        {
        
        //    MyDerivedClass myObj = new MyDerivedClass();//object ()-->MyBaseClass-->MyDerivedClass 构造函数
            
        //    MyDerivedClass myObj = new MyDerivedClass(4);//object()-->MyBaseClass-->MyDerivedClass(int i) 构造函数
            
        //    MyDerivedClass myObj = new MyDerivedClass(4);//    object()-->MyBaseClass-->MyDerivedClass(int i , int j) 构造函数
        //    MyDerivedClass myObj = new MyDerivedClass(5,5);//object()-->MyBaseClass(int i)-->MyDerivedClass(int i , int j) 构造函数
            MyDerivedClass myObj = new MyDerivedClass(); //添加this执行该代码   object()-->MybaseClass()-->MyDerivedClass(int i ,int j)-->MybaseClass() 构造函数
        
        
            Console.Write("Press any key to continue . . . ");
            Console.ReadKey(true);
        }
    }
}