public interface Test
{
void Sound();
}
public class Dog : Test
{
public void Sound()
{
Console.WriteLine("Dog");
}
}
public class Cat : Dog
{
public void Sound()
{
Console.WriteLine("Cat");
}
}
class Program
{
static void Main(string[] args)
{
Cat c=new Cat();
c.Sound();
Console.ReadKey();
}
}结果为Cat
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