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

/*
 * Compare two files byte by byte effectively
 * using new java.nio classes
 */

public class CompareFiles {
 static int compare(String fname1, String fname2) throws Exception {
  return getMBB(fname1).compareTo(getMBB(fname2));
 }

 // getMappedByteBuffer
 private static MappedByteBuffer getMBB(String fname) throws Exception {
  File file=new File(fname);
  return new FileInputStream(file).getChannel().
   map(MapMode.READ_ONLY,0L,file.length());
 }

 public static void main(String args[]) throws Exception {
  int ret=0;
  System.out.println("compare('"+args[0]+ "', '" + args[1] + "') = ");
  long start=System.currentTimeMillis();
  System.out.println( (ret=compare(args[0], args[1])) +
   "\n in "+(System.currentTimeMillis()-start)+" ms");
  System.exit(ret);
 }
} //end of public class CompareFiles