Question

我刚开始使用c＃几小时前，我看到了在c＃中创建类的技巧。我创建了自己的两个类Animal and Dog，其中Dog继承Animal。我的代码没有错误，但我的程序仍然在执行时崩溃。我对oop有一点了解。我在这段代码中遗漏了一些重要内容吗？

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MultipleClasses
{
    class Animal
    {
        public int hands;
        public Boolean feathers;
        public int legs;
        public int getlegs(){ return legs; }
        public void setlegs(int l){this.legs = l;}
        public void sethands(int h){this.hands = h;}
        public int gethands(){return this.hands;}
        public void setfeathers(Boolean f){this.feathers = f;}
        public Boolean getfeathers(){return this.feathers;}
        public Animal(int l=0, int h=0, Boolean f=false){
            this.legs = l;
            this.hands = h;
            this.feathers = f;
        }
    }
    class Dog : Animal
    {
        public string name;
        public int age;
        public string getname(){return this.name;}
        public int getage(){return this.age;}
        public void setname(string n) { this.name = n;}
        public void setage(int g){this.age = g;}

        public Dog(string n, int g, int l, int h, Boolean f) : base(l, h, f)
        {
            this.name = n;
            this.age = g;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Dog a = new Dog("Jack",5,4,0,false);
            Console.WriteLine("The Dog's name is {0} and age is {1} "+a.getname(),a.getage());
        }
    }
}

Answer 1

问题是这一行：

Console.WriteLine("The Dog's name is {0} and age is {1} "+a.getname(),a.getage());

将+更改为,

Console.WriteLine("The Dog's name is {0} and age is {1} ", a.getname(),a.getage());

更正后的输出：

狗的名字是杰克，年龄是5岁

代码还有其他问题，也就是你用某些东西命名的方式，你可能也想阅读有关getter和setter的内容。

Answer 2

重新编写C＃方式代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MultipleClasses
{
   class Animal
   {
      public int hands { get; set; }
      public Boolean feathers { get; set; }
      public int legs { get; set; }
      public Animal(int l = 0, int h = 0, Boolean f = false)
      {
        this.legs = l;
        this.hands = h;
        this.feathers = f;
      }
  }

  class Dog : Animal
  {
     public string name { get; set; }
     public int age { get; set; }
     public Dog(string n, int g, int l, int h, Boolean f)
     {
        this.name = n;
        this.age = g;
        this.legs = l;
        this.hands = h;
        this.feathers = f;
      }
  }

  class Program
  {
    static void Main(string[] args)
    {
        Dog a = new Dog("Jack", 5, 4, 0, false);
        Console.WriteLine("The Dog's name is {0} and age is {1}", a.name.ToString(), a.age.ToString());
    }
  }
}

程序在两个简单的固有类中崩溃。 C＃初学者

2 个答案: