How to Map files to the Memory in Java nio?

Question

I have a text file which I downloaded from the internet. File is large, somewhat around 77MB and I need to map it into the memory so I can read it fast. Here is my code

public class MapRead {

    public MapRead()
    {
        try {
            File file = new File("E:/Amazon HashFile/Hash.txt");
            FileChannel c = new RandomAccessFile(file,"r").getChannel();

            MappedByteBuffer buffer = c.map(FileChannel.MapMode.READ_ONLY, 0,c.size()).load();

            System.out.println(buffer.isLoaded());
            System.out.println(buffer.capacity());

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


}

No good, this generated the below output.

false
81022554

This is my first time trying this. I have no idea what went wrong, or what to do next, to read the file.