Java IO efficient way to read files

The best efficient way is: 

FileChannel with direct ByteBuffer and byte array gets

FileInputStream f = new FileInputStream( name );
FileChannel ch = f.getChannel( );
ByteBuffer bb = ByteBuffer.allocateDirect( BIGSIZE );
byte[] barray = new byte[SIZE];
long checkSum = 0L;
int nRead, nGet;
while ( (nRead=ch.read( bb )) != -1 )
{
    if ( nRead == 0 )
        continue;
    bb.position( 0 );
    bb.limit( nRead );
    while( bb.hasRemaining( ) )
    {
        nGet = Math.min( bb.remaining( ), SIZE );
        bb.get( barray, 0, nGet );
        for ( int i=0; i<nGet; i++ )
            checkSum += barray[i];
    }
    bb.clear( );
}

http://nadeausoftware.com/articles/2008/02/java_tip_how_read_files_quickly#Benchmarks