New and override

New: hides the virtual method of the parent class; allocates memory space in the memory to store new methods, so you can still access the method of the parent class;

Override: overwrites the virtual method of the parent class. In the memory, the memory space used by the parent class method is used.

 

1 namespace leleapplication3
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 can still access the parent class field // 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

Try 2:

Modify:

 

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

Try 2: