代碼實現

public interface Mediator {

    void register(String dname,Department d);
    void command(String dname);
}

/*
 * 同事類接口
 */
public interface Department {

    void selfAction(); //做本部門工作
    void outAction();  //向總經理發出申請
}

public class Development implements Department{
    
    
 
private Mediator m ; //持有中介者（總經理）的引用

    public Development(Mediator m) {
        super();
        this.m = m;
        m.register("development", this);
    }

    @Override
    public void selfAction() {
        System.out.println("開發項目");
    }

    @Override
    public void outAction() {
        System.out.println(
 
"匯報工作，需要資金支持");
    }

}


public class Finacial implements Department{
    
    private Mediator m ; //持有中介者（總經理）的引用

    public Finacial(Mediator m) {
        super();
        this.m = m;
        m.register("finacial", this);
    }

    @Override
    public void selfAction() {
        System.out.println(
 
"數錢");
    }

    @Override
    public void outAction() {
        System.out.println("匯報工作，錢怎麽分配");
    }

}


public class Market implements Department{
    
    private Mediator m ; //持有中介者（總經理）的引用

    public Market(Mediator m) {
        super();
        this.m = m;
        m.register("market", this);
    }

    @Override
    public void selfAction() {
        System.out.println("接項目");
    }

    @Override
    public void outAction() {
        System.out.println("匯報工作，最新市場動態,需要資金支持");
        m.command("finacial");
    }

}

public class President implements Mediator{

    private Map<String,Department> map = new HashMap<String,Department>();
    
    @Override
    public void register(String dname, Department d) {
        map.put(dname,d);
    }

    @Override
    public void command(String dname) {
        map.get(dname).selfAction();
    }

}

public class Client {

    public static void main(String[] args) {
        Mediator m = new President();
        
        Market market = new Market(m);
        Development devp = new Development(m);
        Finacial f = new Finacial(m);
        
        market.selfAction();
        market.outAction();
    }
}

設計模式之中介者模式 Mediator