How to read whole file with read(char[] cbuf, int off, int len)

Question

I've got this soure:

public static void inBufferBooks() throws IOException
{
    Reader inStreamBooks = null;
    BufferedReader bufferIn = null;

    try
    {
        inStreamBooks = new FileReader("Files/BufferBook.txt");
        bufferIn = new BufferedReader(inStreamBooks);

        char text[] = new char[10];

        int i = -1;

        while ((i = inStreamBooks.read(text, 0, 10)) != -1)
        {
            System.out.print(text);
        }

When I read file at the end of the text console printing chars who's fill last array. How can I read whole text from the file without redundant chars from last array?

The variable ``i`` tells you how many characters have been read into your buffer. But you still print the whole array, not only the data from ``text[0]`` to ``text[i-1]``. — f1sh, Jan 06 '17 at 15:32
http://stackoverflow.com/questions/19108624/confusion-on-readchar-cbuf-int-off-int-len-from-class-reader — Sotirios Delimanolis, Jan 06 '17 at 18:05
What’s the point of `bufferIn = new BufferedReader(inStreamBooks);` when you are using the original `FileReader` afterwards? Note that if you would use the `BufferedReader` you’ve created, you could use its `readLine()` method which simplifies your task a lot… — Holger, Jan 06 '17 at 19:22

score 0 · Answer 1 · edited Jun 20 '20 at 09:12

0

How can I read whole text from the file without redundant chars from last array?

Use the value read returns to you to determine how many characters in the array are still valid. From the documentation:

Returns:

The number of characters read, or -1 if the end of the stream has been reached

edited Jun 20 '20 at 09:12

Community

1
1

answered Jan 06 '17 at 15:33

T.J. Crowder

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score 0 · Answer 2 · answered Jan 06 '17 at 15:34

0

You need to remember how may characters you read and only print that many.

for (int len; ((len = inStreamBooks.read(text, 0, text.length)) != -1; ) {
    System.out.print(new String(text, 0, len));
}

answered Jan 06 '17 at 15:34

Peter Lawrey

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score 0 · Answer 3 · answered Jan 19 '17 at 09:06

To resolve the problem I change my while cycle like this:

while((i = bufferText.read(text, 0, text.length)) != -1){
            if(text.length == i){
                System.out.print(text);
            }else if (text.length != i){
                    System.out.print(Arrays.copyOfRange(text, 0, i));
            }

Thanks everyone for the help.

How to read whole file with read(char[] cbuf, int off, int len)

3 Answers3