concretemediator.java

23种设计模式的java实现 include vistor,proxy,bridge

/**
 *  A concrete mediator
 */
public class ConcreteMediator implements Mediator {
    private ColleagueA a;
    private ColleagueB b;
    private ColleagueC c;

    public ConcreteMediator() {
    }
    public void Register(Colleague colleague, String type) {
        if(type == "A") {
                a = (ColleagueA)colleague;
        } else if (type == "B") {
                b = (ColleagueB)colleague;
        } else if (type == "C") {
                c = (ColleagueC)colleague;
        }
    }
    public void Changed(String type) {
        if(type == "A") {
                b.Action();
                c.Action();
        } else if (type == "B") {
                a.Action();
                c.Action();
        } else if (type == "C") {
                a.Action();
                b.Action();
        }
    }
}