Design mode-Mediator mode

Broker Mode: to reduce the direct contact of individual objects, a mediation object is introduced to handle complex operations between objects.

Just like the seller's intermediary. Help to maintain communication between tenants and landlords.

Example Description: House buying and selling intermediary. Sellers and buyers know intermediaries, but buyers and sellers don't know each other.

Define an intermediary (Singleton implementation)

 PackageCom.zpj.designMode.MediatorPattern;Importjava.util.ArrayList;Importjava.util.List; Public classMediator {List<Operator> opers =NewArraylist<operator>();  Public voidaddoperators (Operator oper) {opers.add (oper); }    Private StaticMediator Mediator =NewMediator (); PrivateMediator () {} Public StaticMediator getinstance () {returnMediator; }     Public voidSell (Operator Oper,intPrice ) {System.out.println ("---------For Sale:" + price + "$");  for(inti = 0; I < opers.size (); i++) {Operator op=Opers.get (i); if(Oper! =op) {                if(Op.topprice >Price )                {op.buy (); }            }        }    }}

Define an Operator abstract class

 PackageCom.zpj.designMode.MediatorPattern; Public Abstract classOperator {protectedMediator Mediator =mediator.getinstance (); protected intTopprice = 0;  PublicOperator (intTopprice) {        Super();  This. Topprice =Topprice; }     Public Abstract voidSellintPrice );  Public Abstract voidbuy ();}

Add two examples of house-speculators:

 PackageCom.zpj.designMode.MediatorPattern; Public classOperator01extendsOperator { PublicOperator01 (intBaseprice) {        Super(Baseprice); } @Override Public voidSellintPrice ) {Mediator.sell ( This, Price); } @Override Public voidBuy () {System.out.println ("Operator01-----------I buy!" "); }} PackageCom.zpj.designMode.MediatorPattern; Public classOperator02extendsOperator { PublicOperator02 (intBaseprice) {        Super(Baseprice); } @Override Public voidSellintPrice ) {Mediator.sell ( This, Price); } @Override Public voidBuy () {System.out.println ("Operator02-----------I buy!" "); }}

Examples of Use:

 PackageCom.zpj.designMode.MediatorPattern;Importorg.junit.Test; Public classTestunit {@Test Public voidtest01 () {Mediator Mediator=mediator.getinstance (); Operator OP01=NewOperator01 (12); Operator OP02=NewOperator02 (20);        Mediator.addoperators (OP01);        Mediator.addoperators (OP02); //02 SellersOp02.sell (1); }}

It is important to note that operator can not know each other, but mediator and each operator are aware of each other.

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Design mode-Mediator mode