C# 继承 测试

1、方法重写  
  class Parent
    {
        public void m1()
        {
            m2();
        }
        public virtual void m2()
        {
            Console.WriteLine("I am Parent.");
        }
    }
    class Child : Parent
    {        
        public override void m2()
        {
            Console.WriteLine("I am Child.");
        }

    }
    class Program
    {
        static void Main(string[] args)
        {
            Parent parent = new Parent();
            parent.m1();        //I am parent
            parent.m2();        //I am parent

            Child child = new Child();
            child.m1();         //I am Child
            child.m2();         //I am child

            Parent parent2 = new Child();
            parent2.m1();       //I am Child
            parent2.m2();       //I am Child
        }
    }

 2、方法隐藏

    class Parent
    {
        public void m1()
        {
            m2();
        }
        public void m2()
        {
            Console.WriteLine("I'm parent");
        }
    }
    class Child : Parent
    {
        public new void m2()
        {
            Console.WriteLine("I'm child");
        }
    }
    
   
    class Program
    {
        
        static void Main(string[] args)
        {
            Parent parent = new Parent();
            parent.m1();    //I'm parent
            parent.m2();    //I'm parent

            Child child = new Child();
            child.m1();     //I'm parent
            child.m2();     //I'm child

            Parent child2 = new Child();
            child2.m1();    //I'm parent
            child2.m2();    //I'm parent

        }   
    }