Observer mode-instance

ProgramDESIGN: when the cat shouted, all the mice started to escape and the host was awakened. (C # language)
Requirements:
1. The behavior of rats and Masters Should Be passive.
2. Considering scalability, the call of a cat may cause other association effects.

Key points: 1. linkage effect, runCodeRun the cat. cryed () method. 2. abstract the mouse and the host
Scoring standard: <1>. constructs cat, mouse, and master classes, and enables the program to run (2 points)
<2> extract abstraction from mouse and master (5 points)
<3> As long as Cat. cryed () is executed, the mouse can escape and the host will be awakened. (3 points)

 

 

Code

Using System;
Using System. collections;

Public   Interface Observer
{
Void Response (); // Observer (mouse and host)
}
Public   Interface Subject
{
Void Aimat (Observer obs ); // Observed (CAT)
}
Public   Class Mouse: Observer
{
Private   String Name;
Public Mouse ( String Name, subject subj)
{
This . Name = Name;
Subj. aimat ( This );
}

Public   Void Response ()
{
Console. writeline (name +   " Attempt to escape! " );
}
}
Public   Class MASTER: Observer
{
Public Master (subject subj)
{
Subj. aimat ( This );
}

Public   Void Response ()
{
Console. writeline ( " Host waken! " );
}
}
 
Public   Class Cat: Subject
{
Private Arraylist observers;
Public CAT ()
{
This . Observers =   New Arraylist ();
}
Public   Void Aimat (Observer obs)
{
This . Observers. Add (OBS );
}
Public   Void Cry ()
{
Console. writeline ( " Cat cryed! " );
Foreach (Observer obs In   This . Observers)
{
Obs. Response ();
}
}
}
Class Mainclass
{
Static   Void Main ( String [] ARGs)
{
Cat =   New CAT ();
Mouse mouse1 =   New Mouse ( " Mouse1 " , CAT );
Mouse mouse2 =   New Mouse ( " Mouse2 " , CAT );
Master =   New Master (CAT );
Cat. Cry ();
Console. Read ();
}
}