求一个测试题答案和解释 重要的是解释
class A
{
public A(){
PrintFields();
}
public virtual void PrintFields(){}
}
class B : A
{
int x = 1;
int y;
public B()
{
y = -1;
}
public override void PrintFields()
{
Console.WriteLine("x={0},y={1}", x, y);
}
}
class Program
{
static void Main(string[] args)
{
B b = new B();
}
}