question: public final long readLong ( ) throws java . io . IOException { readFully ( scratch , 0 , 8 ) ; int h = ( ( scratch [ 0 ] & 0xff ) << 24 ) | ( ( scratch [ 1 ] & 0xff ) << 16 ) | ( ( scratch [ 2 ] & 0xff ) << 8 ) | ( ( scratch [ 3 ] & 0xff ) << 0 ) ; int l = ( ( scratch [ 4 ] & 0xff ) << 24 ) | ( ( scratch [ 5 ] & 0xff ) << 16 ) | ( ( scratch [ 6 ] & 0xff ) << 8 ) | ( ( scratch [ 7 ] & 0xff ) << 0 ) ; return ( ( ( long ) h ) << 32L ) | ( ( long ) l ) & 0xffffffffL ; }
target:  See the general contract of the readLong method of DataInput. Bytes for this operation are read from the contained input stream.