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If classes guarantee an interface, you must be able to guarantee a class.
如果类保证了接口，您必须能够保证类。
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They can be used to crate a common interface among a group of classes.
它们可以被用来创造一组类之间的通用接口。
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They can be used to crate a common interface among a group of classes.
它们可以被用来创造一组类之间的通用接口。
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