new与override

new:隐藏了父类的虚拟方法;在内存里面重新分配了内存空间来存放新的方法,所以仍然可以访问父类的方法;

override:重写了父类的虚拟方法;在内存里面使用的是父类方法使用的内存空间.

1 namespace ConsoleApplication3
2 {
3 class Program
4 {
5 static void Main(string[] args)
6 {
7 Bird bird = new Chicken();
8 bird.ShowType();　　　　　　//output1:Type2 is Chicken
　　　　　　　　　Console.WriteLine(Chicken.x); //output: chicken x
　　Console.WriteLine(Bird.x); //output: bird x 仍然可以访问父类的字段
　　　　　　　　　//demo2
//Chicken bird = new Chicken();
8 //bird.ShowType();　　　　　　//output2:Type2 is Chicken
9 Console.ReadLine();
10 }
11 }
12
13
14 public abstract class Animal
15 {
16 public abstract void ShowType();
17
18 public void Eat()
19 {
20 Console.WriteLine("Animal always eat.");
21 }
22 }
23
24 public class Bird : Animal
25 {
public new static string x = "bird x";
26 private string type = "Bird";
27
28 public override void ShowType()
29 {
30 Console.WriteLine("Type is {0}",type);
31 }
32
33 public string color;
34
35 public string Color
36 {
37 get { return color;}
38 set {color = value;}
39 }
40 }
41
42 public class Chicken : Bird
43 {
public new static string x = "chicken x";
44 private string type = "Chicken";
45
46 public override void ShowType()
47 {
48 Console.WriteLine("Type2 is {0}", type);
49 }
50 public void ShowColor()
51 {
52 Console.WriteLine("Color is {0}",Color);
53 }
54 }
55 }
56
尝试2:

修改:

public class Chicken : Bird
{
private string type = "Chicken";

public new void ShowType()
{
Console.WriteLine("Type2 is {0}", type);
}
public void ShowColor()
{
Console.WriteLine("Color is {0}",Color);
}
}

//output1:Type is Bird

//output2:Type2 is Chicken

尝试2: