Try this one.
public class Test
{
public static void main(String[] args) throws Exception {
String filePath = "D:/temp/file";
RandomAccessFile file = new RandomAccessFile(filePath, "rw");
FileChannel chan = file.getChannel();
try {
MappedByteBuffer buffer = chan.map(FileChannel.MapMode.READ_WRITE, 0, 128);
// Do something
buffer.putInt(4);
buffer.force();
Cleaner cleaner = ((sun.nio.ch.DirectBuffer) buffer).cleaner();
if (cleaner != null) {
cleaner.clean();
}
} finally {
chan.close();
file.close();
System.out.println("File closed");
}
System.out.println("Press any key...");
System.in.read();
System.out.println("Finished");
}
}