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Collection 接口所有通用集合实现都有一个带有 Collection 参数的构造函数，此构造函数初始化新集合以包含指定集合中的所有元素，即它允许转换集合的类型。如把一个 Collection<String> s，它可以转化成 List、Set 或其他类型的 Collectio...

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