Java Reference
In-Depth Information
is a digit that denotes part of the integer) and after the initial non-zero digit in a non-zero
decimal literal.
A decimal numeral is either the single ASCII digit
0
, representing the integer zero, or con-
sists of an ASCII digit from
1
to
9
optionally followed by one or more ASCII digits from
0
to
9
interspersed with underscores, representing a positive integer.
DecimalNumeral:
0
NonZeroDigit Digits
opt
NonZeroDigit Underscores Digits
Digits:
Digit
Digit DigitsAndUnderscores
opt
Digit
Digit:
0
NonZeroDigit
NonZeroDigit: one of
1 2 3 4 5 6 7 8 9
DigitsAndUnderscores:
DigitOrUnderscore
DigitsAndUnderscores DigitOrUnderscore
DigitOrUnderscore:
Digit
_
Underscores:
_
Underscores
_
A hexadecimal numeral consists of the leading ASCII characters
0x
or
0X
followed by one
or more ASCII hexadecimal digits interspersed with underscores, and can represent a pos-
itive, zero, or negative integer.
Hexadecimal digits with values 10 through 15 are represented by the ASCII letters
a
through
f
or
A
through
F
, respectively; each letter used as a hexadecimal digit may be up-
percase or lowercase.
HexNumeral:
0 x
HexDigits
0 X
HexDigits
