collection of maximal forbidden sets 最大禁止子集集合
The collection has reached its maximal size, and you are trying to add another element (objects unit).
集合物件已经达成它的最大大小，而且你正在尝试增加另外的一个元件（物件单位） 。
As a final example of using lower bounded wildcards, lets look at the method Collections. Max , which returns the maximal element in a collection passed to it as an argument.
作为使用下界通配符的最后一个例子，让我看看方法Collections . max，返回传递给它作为参数的集合的最大元素。
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