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阅读下面的程序，分析代码是否能编译通过，如果能编译通过，请列出运行的结果。如果不能编译通过，请说明原因。代码一：class Animal{}class Dog:Animal{}class Cat : Animal{}class Test01{static void Main(string[] args){Animal animal = new Dog();Dog dog = new Cat();Console.ReadKey();}}

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代码二：class Animal{public virtual void shout(){Console.WriteLine("I’m a Animal");}}class Dog:Animal{public sealed override void shout(){Console.WriteLine("I’m a Dog");}}class BlackDog : Dog{public override void shout(){Console.WriteLine("I’m a BlackDog");}}class Test02{static void Main(string[] args){Dog dog = new Dog();}}

代码三：class Animal{public virtual void shout(){Console.WriteLine("动物叫！");}}class Dog:Animal{public override void shout(){base.shout();Console.WriteLine("汪汪......");}}class Test03{static void Main(string[] args){Animal animal = new Dog();animal.shout();Console.ReadKey();}}

代码四：interface Animal{void breathe();void run();void eat();}class Dog:Animal{public void breathe(){Console.WriteLine("会呼吸");}public void eat(){Console.WriteLine("会吃饭");}}class Test04{static void Main(string[] args){Dog dog = new Dog();dog.breathe();dog.eat();Console.ReadKey();}}

请说明什么是方法重写。