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Java read file Scanner vs BufferedReader

Successful Salamander answered on August 22, 2022 Popularity 9/10 Helpfulness 4/10

answer Java read file Scanner vs BufferedReader

Java read file Scanner vs BufferedReader

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Scanner is used for parsing tokens from the contents of the stream while BufferedReader just reads the stream and does not do any special parsing.

In fact you can pass a BufferedReader to a scanner as the source of characters to parse.



In currently latest JDK 18 release/build (b37), the Scanner has a smaller buffer (1024 chars) as opposed to the BufferedReader (8192 chars), but it's more than sufficient.

As to the choice, use the Scanner if you want to parse the file, use the BufferedReader if you want to read the file line by line. Also see the introductory text of their aforelinked API documentations.

Parsing = interpreting the given input as tokens (parts). It's able to give back you specific parts directly as int, string, decimal, etc. See also all those nextXxx() methods in Scanner class.
Reading = dumb streaming. It keeps giving back you all characters, which you in turn have to manually inspect if you'd like to match or compose something useful. But if you don't need to do that anyway, then reading is sufficient.

Popularity 9/10 Helpfulness 4/10 Language java

Source: stackoverflow.com

Tags: bufferedreader file java

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Contributed on Aug 22 2022

Successful Salamander

0 Answers Avg Quality 2/10

Java read file Scanner vs BufferedReader

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Java read file Scanner vs BufferedReader

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