Design Patterns dynamic proxy mode

Foreword

Each agent class can only serve as an interface, so that the program would have a lot of development in the proxy class.
So we will try to complete all of the proxy function through a proxy class, then we need to use dynamic proxies

In Java in order to achieve dynamic proxy mechanism, it is necessary java.lang.reflect.InvocationHandlerinterfaces and java.lang.reflect.Proxysupport classes

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java.lang.reflect.InvocationHandlerThe interface is defined as follows:

//Object proxy:被代理的对象  
//Method method:要调用的方法  
//Object[] args:方法调用时所需要参数  
public interface InvocationHandler {  
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable;  
}  

java.lang.reflect.ProxyClass is defined as follows:

//CLassLoader loader:类的加载器  
//Class<?> interfaces:得到全部的接口  
//InvocationHandler h:得到InvocationHandler接口的子类的实例  
public static Object newProxyInstance(ClassLoader loader, Class<?>[] interfaces, InvocationHandler h) throws IllegalArgumentException  

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Dynamic proxy class can only proxy interfaces (abstract classes are not supported), the proxy class needs to implement InvocationHandler class, implement invoke methods. The invoke method returns a value needs to be called when the invoke method is to call all the methods are proxy interface is a proxy class that implements the interface