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public static abstract class Mediator {
    public abstract void contact(String message, Person person);
}
@EqualsAndHashCode(callSuper = true)
@Data
public static class MediatorStructure extends Mediator {
    private HouseOwner houseOwner;
    private Tenant tenant;
    public void contact(String message, Person person) {
        if (person == houseOwner) {
            tenant.getMessage(message);
        } else {
            houseOwner.getMessage(message);
        }
    }
}

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@AllArgsConstructor
public static abstract class Person {
    protected String name;
    protected Mediator mediator;
}
public static class HouseOwner extends Person {
    public HouseOwner(String name, Mediator mediator) {
        super(name, mediator);
    }
    public void contact(String message) {
        mediator.contact(message, this);
    }
    public void getMessage(String message) {
        System.out.println("房主" + name + "获取到的信息是：" + message);
    }
}
public static class Tenant extends Person {
    public Tenant(String name, Mediator mediator) {
        super(name, mediator);
    }
    public void contact(String message) {
        mediator.contact(message, this);
    }
    public void getMessage(String message) {
        System.out.println("租房者" + name + "获取到的信息是：" + message);
    }
}

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MediatorStructure mediator = new MediatorStructure();

Tenant tenant = new Tenant("李四", mediator);
mediator.setTenant(tenant);

HouseOwner houseOwner = new HouseOwner("张三", mediator);
mediator.setHouseOwner(houseOwner);

tenant.contact("我要租三室的房子！！！");
houseOwner.contact("我这里有三室的房子，你要租吗？");

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房主张三获取到的信息是：我要租三室的房子！！！
租房者李四获取到的信息是：我这里有三室的房子，你要租吗？