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掘金 - juejin.im - 一个帮助开发者成长的社区
掘金是一个帮助开发者成长的社区，是给开发者用的 Hacker News，给设计师用的 Designer News，和给产品经理用的...
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Sealed classes are used for representing restricted class hierarchies, when a value can have one of the types from a limited set, but cannot have any other type
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