question: public static long findNumber ( String str , int offset ) throws TagException { if ( str == null ) { throw new NullPointerException ( "String is null" ) ; } if ( ( offset < 0 ) || ( offset >= str . length ( ) ) ) { throw new IndexOutOfBoundsException ( "Offset to image string is out of bounds: offset = " + offset + ", string.length()" + str . length ( ) ) ; } int i ; int j ; long num ; i = offset ; while ( i < str . length ( ) ) { if ( ( ( str . charAt ( i ) >= '0' ) && ( str . charAt ( i ) <= '9' ) ) || ( str . charAt ( i ) == '-' ) ) { break ; } i ++ ; } j = i + 1 ; while ( j < str . length ( ) ) { if ( ( ( str . charAt ( j ) < '0' ) || ( str . charAt ( j ) > '9' ) ) ) { break ; } j ++ ; } if ( ( j <= str . length ( ) ) && ( j > i ) ) { num = Long . parseLong ( str . substring ( i , j ) ) ; } else { throw new TagException ( "Unable to find integer in string: " + str ) ; } return num ; }
target:  Find the first whole number that can be parsed from the string