Java design pattern--behavioral pattern--mediator pattern

How to understand the intermediary mode, I would use real estate intermediary to understand it. Oh

Broker Mode:

　　

1 Broker Mode2 Overview3 encapsulates a series of object interactions with a mediation object. The mediator makes the objects not need to explicitly reference each other, so that they are loosely coupled, and can independently change the interaction between them. 4  5  6 Applicability7 1. A group of objects communicates in a well-defined but complex way. The resulting interdependence structure is confusing and difficult to understand. 8 9 2. An object that references many other objects and communicates directly with those objects makes it difficult to reuse the object. Ten  One 3. Want to customize a behavior that is distributed across multiple classes without having to generate too many subclasses.  A   -   - participants the 1.Mediator - A mediator defines an interface for communicating with each colleague (colleague) object.  -  - 2.ConcreteMediator + the specific mediator realizes the collaborative behavior by coordinating the colleagues ' objects.  - understand and maintain all of its colleagues.  +  A 3.Colleagueclass at each colleague class is aware of its mediator object.  -Each colleague object communicates with its intermediary when it needs to communicate with other colleagues.

Test class:

　　

1  Public classTest {2 3      Public Static voidMain (string[] args) {4Mediator Med =Newconcretemediator ();5         //the boss is here.6Med.notice ("Boss");7         8         //the client is here.9Med.notice ("Client");Ten     } One}

1  Public Abstract class Mediator {23      Public Abstract void Notice (String content); 4 }

1  Public classConcretemediatorextendsMediator {2 3     PrivateColleaguea CA;4     5     PrivateColleagueb CB;6     7      PublicConcretemediator () {8CA =NewColleaguea ();9CB =NewColleagueb ();Ten     } One      A      Public voidNotice (String content) { -         if(Content.equals ("Boss")) { -             //The boss is here, notify staff A. the ca.action (); -         } -         if(Content.equals ("Client")) { -             //The customer has come, inform the front desk B + cb.action (); -         } +     } A}

1  Public Abstract class colleague {2      Public Abstract void action (); 3 }

 1  public  class  Colleaguea extends   colleague { 2  4  public  void   action () { 5  System.out.println ("Normal employee hard work"  6   7  }

1  Public class extends colleague {23      Public void action () {4         System.out.println ("The receptionist was very friendly." ); 5     }6 }

Do not write code to see the code, I am ...

　　

Java design pattern--behavioral pattern--mediator pattern