CODEWITHSUNDEEP
javafileinputstreamfileoutputstream
kaka
kaka

Reputation: 815

FileInputStream does not read the correct value?

public static void main(String[] args) {
        try {
            File f = new File("file.txt");
            f.createNewFile();
            OutputStream fos = new FileOutputStream(f);
            InputStream fis = new FileInputStream(f);


            fos.write(200);



            System.out.println(fis.read());


        } catch (Exception ex) {
            Logger.getLogger(MySimple.class.getName()).log(Level.SEVERE, null, ex);
        }

    }

this prints 200 as expected. however when I write 2000 it reads 208. could please explain why it behaves in this way?

Upvotes: 0

Views: 40

Answers (1)

stdunbar
stdunbar

Reputation: 17435

The method call fos.write(200); writes a byte of data. When you write 200, it saves that in an 8 bit value just fine.

But when you try to write 2000, it ignores anything above the first 8 bits. 2000 in binary is 0111 1101 0000. But since the top 4 bits are lost, the resulting value written is 1101 0000 or 208 in decimal.

The methods are a bit confusing since write() takes an integer value and read() returns an integer value.

Upvotes: 2

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