Net面试题

public class A{    public virtual void Fun1(int i)    {        Console.WriteLine(i);    }    public void Fun2(A a)    {        a.Fun1(1);        Fun1(5);    }} public class B : A{    public override void Fun1(int i)    {        base.Fun1 (i + 1);    }    public static void Main()    {        B b = new B();        A a = new A();        a.Fun2(b);        b.Fun2(a);    }}

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