int getPrefixedDigitArea() {

        if (this.multi == null) {
            return 0;
        }

        int digits = 0;

        for (int i = 0, n = this.multi.length(); i < n && Character.isDigit(this.multi.charAt(i)); i++) {
            digits++;
        }

        return digits;

    }
int getPrefixedDigitArea ( ) { if ( this . multi == null ) { return 0 ; } int digits = 0 ; for ( int i = 0 , n = this . multi . length ( ) ; i < n && Character . isDigit ( this . multi . charAt ( i ) ) ; i ++ ) { digits ++ ; } return digits ; }
count of leading digits