Why is not possible to reopen a closed (standard) stream?

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why is not possible to reopen a closed stream in Java?

That’s simply the nature of the underlying operating system constructs that Java streams represent. A stream is essentially a data conduit. Once you close it, it no longer exists. You may be able to create a new one between the same endpoints, but that yields a fundamentally different stream. We could go into implementation considerations such as buffering and stream positioning, but those are really side issues.

You also asked specifically about the standard streams. These are some of the cases that you cannot recreate. The operating system provides each process with its set of standard streams. Once they are closed, there is no way to obtain equivalents. You can put different streams in their place, but you cannot connect them to the original endpoints.

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