行为型模式-中介者模式

 

package per.mjn.pattern.mediator;
 
public abstract class Person {
 
    protected String name;
    protected Mediator mediator;
 
    public Person(String name, Mediator mediator) {
        this.name = name;
        this.mediator = mediator;
    }
}

package per.mjn.pattern.mediator;
 
// 租房者
public class Tenant extends Person {
    public Tenant(String name, Mediator mediator) {
        super(name, mediator);
    }
 
    // 和中介联系（沟通）
    public void contact(String message) {
        mediator.contact(message, this);
    }
 
    // 获取信息
    public void getMessage(String message) {
        System.out.println("租房者" + name + "获取到的信息是：" + message);
    }
}

package per.mjn.pattern.mediator;
 
public class HouseOwner extends Person {
 
    public HouseOwner(String name, Mediator mediator) {
        super(name, mediator);
    }
 
    // 和中介联系（沟通）
    public void contact(String message) {
        mediator.contact(message, this);
    }
 
    // 获取信息
    public void getMessage(String message) {
        System.out.println("房主" + name + "获取到的信息是：" + message);
    }
}

package per.mjn.pattern.mediator;
 
public abstract class Mediator {
    public abstract void contact(String message, Person person);
}

package per.mjn.pattern.mediator;
 
public class MediatorStructure extends Mediator {
 
    // 聚合房主和租房者对象
    private HouseOwner houseOwner;
    private Tenant tenant;
 
    @Override
    public void contact(String message, Person person) {
        if (person == houseOwner) {
            tenant.getMessage(message);
        } else {
            houseOwner.getMessage(message);
        }
    }
 
    public HouseOwner getHouseOwner() {
        return houseOwner;
    }
 
    public void setHouseOwner(HouseOwner houseOwner) {
        this.houseOwner = houseOwner;
    }
 
    public Tenant getTenant() {
        return tenant;
    }
 
    public void setTenant(Tenant tenant) {
        this.tenant = tenant;
    }
}

package per.mjn.pattern.mediator;
 
public class Client {
    public static void main(String[] args) {
        // 创建中介者对象
        MediatorStructure mediator = new MediatorStructure();
 
        // 创建租房者对象
        Tenant tenant = new Tenant("李四", mediator);
 
        // 创建房主对象
        HouseOwner houseOwner = new HouseOwner("张三", mediator);
 
        // 中介者要知道具体的房主和租房者
        mediator.setTenant(tenant);
        mediator.setHouseOwner(houseOwner);
 
        tenant.contact("我要租三室的房子！！");
        houseOwner.contact("我这有！");
    }
}