Java MappedByteBuffer read

import java.io.FileInputStream;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;

public class Main {
  public static void main(String[] args) throws Exception {
    FileInputStream fis = new FileInputStream("Main.java");
    FileChannel fc = fis.getChannel();

    long startRegion = 0;
    long endRegion = fc.size();
    MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_ONLY, startRegion,
        endRegion);/*www. ja va  2s.  c  o  m*/
    while (mbb.hasRemaining()) {
      System.out.print((char) mbb.get());
    }

    fc.close();
    fis.close();
  }
}