设计模式-结构篇（代理模式）

代理模式:

一个类代表另一个类的功能

有些事情本应该是你做的，但是你不想做或者不方便做的时候，叫别人替你完成.

静态代理
动态代理

/**
 * Created by malei on 2016/12/6.
 * 代理人, 由于需要帮委托人带饭, 也必须实现午饭接口
 */
public class ProxyMan implements Lunch {

    private final You mYou;

    public ProxyMan(You you) {
        mYou = you;
    }
    @Override
    public void eat() {
        mYou.eat();
    }

    //静态代理
    public static void main(String[] ages){
        You you = new You();
        ProxyMan man = new ProxyMan(you);
        man.eat();
    }

    //动态代理
    public static void main2(String[] ages){
        You you = new You();
        Lunch people = (Lunch) Proxy.newProxyInstance(
                                          you.getClass().getClassLoader(),
                                          new Class[]{Lunch.class},
                                          new InvocationHandler() {
                    @Override
                    public Object invoke(Object proxy, Method method, 
                                  Object[] args) throws Throwable {
                        return method.invoke(you,args);
                    }
                });
        people.eat();
    }
}

/**
 * Created by malei on 2016/12/6.
 */
public class You implements Lunch {

    @Override
    public void eat() {
        Log.show("我要吃小炒肝尖！");
    }
}

/**
 * Created by malei on 2016/12/6.
 * 午饭的规范
 */
public interface Lunch {
    void eat();
}