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import java.io.File;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
public class Main {
public static void main(String[] argv) throws Exception {
File file = new File("filename");
FileChannel roChannel = new RandomAccessFile(file, "r").getChannel();
ByteBuffer readonlybuffer = roChannel.map(FileChannel.MapMode.READ_ONLY, 0, (int) roChannel
.size());
FileChannel rwChannel = new RandomAccessFile(file, "rw").getChannel();
ByteBuffer writeonlybuffer = rwChannel.map(FileChannel.MapMode.READ_WRITE, 0, (int) rwChannel
.size());
// Create a private (copy-on-write) memory-mapped file.
FileChannel pvChannel = new RandomAccessFile(file, "rw").getChannel();
ByteBuffer privatebuffer = roChannel.map(FileChannel.MapMode.READ_WRITE, 0, (int) rwChannel
.size());
}
}
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