当前计算的结果依赖于之前的部分结果，所以，在每次后续递归调用中，我们向前传递那些结果。

The result of the present computation depended on the partial results before it, so in each successive recursive call, we pass those results forward.

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区别在于，使用递归函数极少被迫修改任何一个变量——只需要将新值作为参数传递给下一次函数调用。

The difference is that with recursive functions, you rarely have to modify any variable — you just pass the new values as parameters to the next function call.

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为了在递归方法中传递，匿名类应该扩展方法已知的包装器类型。

To pass this to a recursive method, the anonymous class should extend a wrapper type known to the method.

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