Dynamic Delegation and Its Applications

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Tutorial: Dynamic Delegation and Its Applications

Dynamic Delegation and Its Applications The Proxy pattern is an important and widely used design pattern in object-oriented programming. Do you ever use Proxy in Java since its introduction in JDK 1.3? A dynamic proxy class is a class that implements a l

Tutorial Details:

One limitation of Proxy is that it can only accept interfaces. In some circumstances, you need to apply the Proxy pattern not only to interfaces, but also to abstract classes, and even concrete classes.

This article introduces Dynamic Delegation, which can create delegation for both interfaces and classes at runtime.

Proxy Overview
In JDK 1.3, the Proxy class was added to java.lang.reflect. It can create a concrete class that implements all of the specified interfaces at runtime. The dynamically generated class redirects all of the method calls defined in the interfaces to an InvocationHandler.

Given two interfaces, Idel1 and Idel2, Proxy will create a IdelProxy class as the proxy of these two interfaces (I use IdelProxy as the generated proxy class name for convenience).

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