在代理中对方法的调用委托到下面相应的对象中。

The method invocations on the proxy are delegated to the underlying objects.

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它首先验证方法调用的方法参数，然后把方法调用委托给实现类。

It will first validate method parameters upon a method invocation and then delegate the method call to the implementation class.

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例如，代理类可以把方法调用委托其他任何对象，甚至是处理程序本身。

For example, the proxy class could delegate the method invocation to any other object or even handle it itself.

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