是否有可能没有变量且带有方法的类? [英] Is it possible to have class without variables and with methods?

问题描述

我正在用多态性解决这个问题.我需要用5种动物打印出这首歌的诗句.每只动物都重复这首诗，并为该动物使用适当的声音，例如，母牛发出呜呜"声，鸭子发出嘎嘎声"等.我想问一下是吗可能只具有方法的类.另外这是我的代码.

I'm solving this problem with polymorphism. I need to print out verse of the song with 5 animals.The verse is repeated for each animal and the appropriate sound for the animal is used eg cows go "moo", ducks go "quack" etc. I would like to ask is it possible to have a class only with methods. In addition here is my code.

public class Animal
{
    public virtual void PrintSong()
    {

    }
}

public class Cow : Animal
{
    public override void PrintSong()
    {
        Console.WriteLine("I go \"Mooo\" (I'm a cow, I'm a cow, I'm a cow)");        
    }
}

public class Pig : Animal
{
    public override void PrintSong()
    {
        Console.WriteLine("I go \"Oink\" (I'm a pig, I'm a pig, I'm a pig)");  
    }
}

static void Main(string[] args)
{
    Animal[] animals = new Animal[2];
    animals[0] = new Cow();
    animals[1] = new Pig();

    foreach (Animal a in animals)
    {
        a.PrintSong();
    }
}

推荐答案

是

一个类不必具有方法或字段/变量

A class doesnt have to have methods or fields / variables

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