代理设计模式

public class ProxyDemo {
	public static void main(String[] args) {
		RentHouse rent = new RentCompany(new RealRent());
		rent.house("小心黑ZhongJie");
		rent.house("租房贵");
	}
}
interface RentHouse {//租房
	public void house(String url);
}
class RealRent implements RentHouse {
	public void house(String url) {
		System.out.println("北京:" + url);
	}
}

class RentCompany implements RentHouse {
	private RentHouse r;//保存真正租房操作
	public RentCompany(RentHouse r) {
		this.r = r;
	}
	public boolean check(String url) {
		if (url.contains("黑ZhongJie")) {
			System.out.println("不能租房");
			return false;
		}
		return true;
	}
	public void house(String url) {
		if (this.check(url)) {// 通过检查了
			this.r.house(url);//真实操作
		}
	}
}