This library contains the StreamUtil, that contains flatten methods to flatten any stream of optionals to the stream of the type contained in the optionals. These flatten methods also supports boxed ...
> 原文:[https://www . geeksforgeeks . org/optional int-empty-method-in-Java-with-examples/](https://www.geeksforgeeks.org/optionalint-empty-method-in-java-with ...
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