question: public static void writePaddedInteger ( Writer out , long value , int size ) throws IOException { int intValue = ( int ) value ; if ( intValue == value ) { writePaddedInteger ( out , intValue , size ) ; } else if ( size <= 19 ) { out . write ( Long . toString ( value ) ) ; } else { if ( value < 0 ) { out . write ( '-' ) ; if ( value != Long . MIN_VALUE ) { value = - value ; } else { for ( ; size > 19 ; size -- ) { out . write ( '0' ) ; } out . write ( "9223372036854775808" ) ; return ; } } int digits = ( int ) ( Math . log ( value ) / LOG_10 ) + 1 ; for ( ; size > digits ; size -- ) { out . write ( '0' ) ; } out . write ( Long . toString ( value ) ) ; } }
target:  Converts an integer to a string, prepended with a variable amount of '0' pad characters, and writes it to the given writer. <p>This method is optimized for converting small values to strings.