In the Groovy example, you aren't required to create the extra classes explicitly to implement the interface that defines the call's semantics.
在Groovy示例中，您不需要显式地创建额外的类来实现定义该调用语义的接口。
When you explicitly implement a member specified by an interface, you prefix the implementation with the name of the interface it relates to, as illustrated by Figure 12-6.
当你明确地实现由一个接口所指定的成员时，你用与之相关的接口名作为该实现的前缀，如图12 - 6所示。
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