if (argv.length == 0) {
System.out.println ("Usage: filename");
return;
}
String filename = argv [0];
RandomAccessFile raf1 = new RandomAccessFile (filename, "rw");
FileChannel fc1 = raf1.getChannel();
RandomAccessFile raf2 = new RandomAccessFile (filename, "rw");
FileChannel fc2 = raf2.getChannel();
System.out.println ("Grabbing first lock");
FileLock lock1 = fc1.lock (0L, Integer.MAX_VALUE, false);
System.out.println ("Grabbing second lock");
FileLock lock2 = fc2.lock (5, 10, false);
System.out.println ("Exiting");
