import java.io.FileInputStream;
import java.io.InputStream;
 
public class ReadByteStream {
 
    public static void main(String[] args) {
        int buffer_size = 5;
 
        byte[] buffer = new byte[buffer_size];
        try {
            // Assuming filename.txt does exist. Tested with file containing letters from a
            // to z.
            InputStream inputStream = new FileInputStream("./filename.txt");
 
            // Total length of stream.
            int total_length = inputStream.available();
 
            // *** Beginning buffer
            inputStream.read(buffer); // read stream data into buffer
            displayBuffer("Beginning: ", buffer);
 
            // *** Middle buffer
            int skip_n_to_middle = (total_length / 2) - (buffer_size / 2) - buffer_size;
            System.out.println("\tWill skip the next " + skip_n_to_middle + " bytes.");
            inputStream.skip(skip_n_to_middle);
            inputStream.read(buffer);
            displayBuffer("Middle: ", buffer);
 
            // *** Last buffer
            int skip_n_to_last = total_length - buffer_size 
                                        - skip_n_to_middle - buffer_size - buffer_size;
            System.out.println("\tWill skip the next " + skip_n_to_last + " bytes.");
            inputStream.skip(skip_n_to_last);
            inputStream.read(buffer);
            displayBuffer("Last: ", buffer);
 
            // Use as a marker to see non-visible character(e.g. newline).
            System.out.println("DONE"); 
 
            inputStream.close();
 
        } catch (Exception e) {
            e.printStackTrace();
        }
 
    }
 
    // Helper to display buffer.
    static public void displayBuffer(String text, byte[] buffer) {
        // Text to print before the buffer.
        System.out.print(text);
 
        char c;
        // For each byte in the buffer
        for (byte b : buffer) {
            // Convert byte to character
            c = (char) b;
 
            // Print character
            System.out.print(c);
        }
        System.out.println();
    }
 
}