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Thread: Problem understanding read method.

  1. #1
    Junior Member
    Join Date
    Nov 2012
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    Default Problem understanding read method.

    I am confused. In the program below, the read method converts the fin object into what appears to characters. That's why the variable "i" is converted into the character type. I thought the character type could only be used to display one letter, number, or other symbol. Why then was the whole file printed to screen. Please explain to me.


    try { 
          // read bytes until EOF is encountered 
          do { 
            i = fin.read(); 
            if(i != -1) System.out.print((char) i); 
          } while(i != -1); 
        } catch(IOException exc) {
          System.out.println("Error reading file.");

    --- Update ---

    I was just wondering. The read method reads the file each byte at a time. Then it returns -1 when done or a error message if it dosn't finish. Am I able to see characters because of the conversion used in the "println" statement. Please let me know if this is true.


  2. #2
    Super Moderator Norm's Avatar
    Join Date
    May 2010
    On vacation
    Thanked 2,425 Times in 2,378 Posts

    Default Re: Problem understanding read method.

    Am I able to see characters because of the conversion used in the "println" statement.
    By conversion I assume you mean the cast: (char) which caused the print method to display the contents of the int variable as a char instead of as an int. See the ASCII character values table to see the int values for chars
    If you don't understand my answer, don't ignore it, ask a question.

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