Intermediary mode in Design Mode

Definition: a mediation object is used to encapsulate a series of object interactions. The intermediary makes the objects do not need to be explicitly referenced to each other, so that the coupling is loose and the interaction between them can be changed independently.

Structure:

Sample Code:

Public abstract class mediator {public abstract void send (string message, colleague);} public class concretemediator extends mediator {collect colleague1; Collect colleague2; Public concretecolleague1 getcolleague1 () {return colleague1 ;} public void setcolleague1 (concretecolleague1 colleague1) {This. colleague1 = colleague1;} public concretecolleague2 getcolleague2 () {return colleague2;} public void setcolleague2 (concretecolleague2 colleague2) {This. colleague2 = colleague2;} @ overridepublic void send (string message, colleague) {// todo auto-generated method stubif (colleague = colleague1) {colleague2.notify (Message );} else {colleague1.notify (Message) ;}} public abstract class colleague {protected mediator; Public colleague (mediator) {This. mediator = mediator ;}} public class concretecolleague1 extends colleague {public concretecolleague1 (mediator) {super (mediator); // todo auto-generated constructor stub} public void send (string message) {mediator. send (message, this);} public void receivy (string message) {system. out. println ("colleague 1 get message:" + message) ;}} public class concretecolleague2 extends colleague {public concretecolleague2 (mediator) {super (mediator ); // todo auto-generated constructor stub} public void send (string message) {mediator. send (message, this);} public void receivy (string message) {system. out. println ("colleague 2 get message:" + message );}}

The client code is as follows:

Public class client {public static void main (string [] ARGs) {concretemediator M = new concretemediator (); concretecolleague1 C1 = new concretecolleague1 (m ); concretecolleague2 C2 = new concretecolleague2 (m); M. colleague1 = C1; M. colleague2 = c2; c1.send ("have you eaten? "); C2.send (" no, are you going to treat me? ");}}

Output result:

Colleague 2 got the message: Have you ever eaten?

Colleague 1 received a message: No. Are you planning to treat me?

Intermediary mode in Design Mode