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syntactic unit > scoping unit > package > java.io
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java.io comparison table
Subject have is a kind of is a subtopic of is an instance of import when has definition contain
packagea namescoping unitPackages  A collection of related classes and interfaces that provides access protection and namespace management0 or more classes and 0 or more interfaces
java.iospecification Input and Outputpackageyou are using file input or file output streamsA package that contains input and output classesinput and output classes

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