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Thread: What is the correct way to write to a Random Access File?

  1. #1
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    Default What is the correct way to write to a Random Access File?

    I'm using the "writeChar", "writeInt", etc methods, but they're making the file look really funky, like this:

    __john_t__smith_ 454545454__history@_______

    I have no idea what that is or why it's doing that. It looks ever weirder in the file itself, and I couldn't even copy paste it directly to here.

    This is my code:

             public void writeToFile(RandomAccessFile raf)
            {              // write info to the file
                            raf.writeUTF(fname);
                            raf.writeChar(middleI);
                            raf.writeUTF(lname);
                            raf.writeUTF(ID);
                            raf.writeUTF(major);
                            raf.writeDouble(GPA);
     
                            // close the file
                            raf.close();
             }


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    Default Re: What is the correct way to write to a Random Access File?

    anyone?

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    Default Re: What is the correct way to write to a Random Access File?

    What are you expecting it to look like? Have you reviewed the API or Oracle's tutorial for hints/suggestions?

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    Default Re: What is the correct way to write to a Random Access File?

    Yes, I have. I didn't see anything that claimed to do anything other than write to the file, which is what this is kind of doing.

    I expect it to look like it looks when I write the information to a normal file, like this:

    john t smith 454545454 history

    That is, just characters that I typed in. I don't understand the weird things I'm seeing (little vertically standing rectangles standing upright between all the fields....I tried copy pasting them but it won't let me.) That doesn't look right....

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    Default Re: What is the correct way to write to a Random Access File?

    the weird things I'm seeing (little vertically standing rectangles standing upright between all the fields.
    Read the API doc for the write methods you are using for the explanation.
    Basically java needs to save the String's length in the file so it knows how long it is. The length is written in binary.
    Those write commands do NOT write a text file.
    Use a hex editor to see what was written.
    If you don't understand my answer, don't ignore it, ask a question.

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