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Java: what file extension should be used when recording objects using ObjectOutputStream

The API shows .tmpin my text book is used .dat, and I saw .ser
Is it important?

I am writing arraylist objects

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3 answers

Extensions do not matter. You can also use your nicolas name as an extension. Extensions are designed to bind files to a specific program.

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. . , abc.txt . .txt, . , , .

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Many people use .ser. You can use .bin, everything you really like, except for those that indicate text: .txt, .doc, etc. This is binary, not text.

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Source: https://habr.com/ru/post/1540173/

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