Read all lines with BufferedReader

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醉梦人生
醉梦人生 2020-12-08 14:24

I want to type a multiple line text into the console using a BufferedReader and when I hit \"Enter\" to find the sum of the length of the whole text. The problem is that it

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  •  谎友^
    谎友^ (楼主)
    2020-12-08 14:52

    Snarky answer: what you're doing wrong is only creating 2 objects in Java to do something... if you search, you can probably find a few more classes that extend BufferedReader or ExtendedBufferReader etc., and then it can be real Enterprise Java.

    Now that i've gotten that out of my system: more useful answer. System.in is closed when you input EOF, which is Control-D under Linux and I think MacOS, and I think Control-Z plus enter under Windows. If you want to check for enter (or more specifically, two enters... one to finish the last line and one to indicate that you're done, which is essentially how http handles determining when the http headers are finished and it's time for the http body, then @dbank 's solution should be a viable option with a minor fix I'm going to try to make to move the ! inside the while predicate instead of !while.

    (Edit #2: realized readLine strips the newline, so an empty line would "" instead of the newline, so now my code devolves to another answer with the EOF bit as an answer instead of comment)

    Edit... that's weird, @dbank had answered while I was typing my answer, and I would have stopped had I not though mentioning the EOF alternative. To repeat his code from memory with the edit I was going to make:

    InputStreamReader instream = new InputStreamReader(System.in);
    BufferedReader buffer = new BufferedReader(instream);
    
        line= buffer.readLine();
        while (line != null && !line.equals("")){
            length = length + line.length();
            line= buffer.readLine();
        }
    

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