@Beta @GwtCompatible public final class UnsignedLongs extends Object
long
primitives that interpret values as
unsigned (that is, any negative value x
is treated as the positive value
2^64 + x
). The methods for which signedness is not an issue are in Longs
, as
well as signed versions of methods for which signedness is an issue.
In addition, this class provides several static methods for converting a long
to a
String
and a String
to a long
that treat the long
as an unsigned
number.
Users of these utilities must be extremely careful not to mix up signed and unsigned
long
values. When possible, it is recommended that the UnsignedLong
wrapper
class be used, at a small efficiency penalty, to enforce the distinction in the type system.
See the Guava User Guide article on unsigned primitive utilities.
Modifier and Type  Field and Description 

static long 
MAX_VALUE 
Modifier and Type  Method and Description 

static int 
compare(long a,
long b)
Compares the two specified
long values, treating them as unsigned values between
0 and 2^64  1 inclusive. 
static long 
decode(String stringValue)
Returns the unsigned
long value represented by the given string. 
static long 
divide(long dividend,
long divisor)
Returns dividend / divisor, where the dividend and divisor are treated as unsigned 64bit
quantities.

static String 
join(String separator,
long... array)
Returns a string containing the supplied unsigned
long values separated by
separator . 
static Comparator<long[]> 
lexicographicalComparator()
Returns a comparator that compares two arrays of unsigned
long values
lexicographically. 
static long 
max(long... array)
Returns the greatest value present in
array , treating values as unsigned. 
static long 
min(long... array)
Returns the least value present in
array , treating values as unsigned. 
static long 
parseUnsignedLong(String s)
Returns the unsigned
long value represented by the given decimal string. 
static long 
parseUnsignedLong(String s,
int radix)
Returns the unsigned
long value represented by a string with the given radix. 
static long 
remainder(long dividend,
long divisor)
Returns dividend % divisor, where the dividend and divisor are treated as unsigned 64bit
quantities.

static String 
toString(long x)
Returns a string representation of x, where x is treated as unsigned.

static String 
toString(long x,
int radix)
Returns a string representation of
x for the given radix, where x is treated
as unsigned. 
public static final long MAX_VALUE
public static int compare(long a, long b)
long
values, treating them as unsigned values between
0
and 2^64  1
inclusive.a
 the first unsigned long
to compareb
 the second unsigned long
to comparea
is less than b
; a positive value if a
is
greater than b
; or zero if they are equalpublic static long min(long... array)
array
, treating values as unsigned.array
 a nonempty array of unsigned long
valuesarray
that is less than or equal to every other value in
the array according to compare(long, long)
IllegalArgumentException
 if array
is emptypublic static long max(long... array)
array
, treating values as unsigned.array
 a nonempty array of unsigned long
valuesarray
that is greater than or equal to every other value
in the array according to compare(long, long)
IllegalArgumentException
 if array
is emptypublic static String join(String separator, long... array)
long
values separated by
separator
. For example, join("", 1, 2, 3)
returns the string "123"
.separator
 the text that should appear between consecutive values in the resulting
string (but not at the start or end)array
 an array of unsigned long
values, possibly emptypublic static Comparator<long[]> lexicographicalComparator()
long
values
lexicographically. That is, it compares, using compare(long, long)
), the first pair of
values that follow any common prefix, or when one array is a prefix of the other, treats the
shorter array as the lesser. For example, [] < [1L] < [1L, 2L] < [2L] < [1L << 63]
.
The returned comparator is inconsistent with Object.equals(Object)
(since arrays
support only identity equality), but it is consistent with
Arrays.equals(long[], long[])
.
public static long divide(long dividend, long divisor)
dividend
 the dividend (numerator)divisor
 the divisor (denominator)ArithmeticException
 if divisor is 0public static long remainder(long dividend, long divisor)
dividend
 the dividend (numerator)divisor
 the divisor (denominator)ArithmeticException
 if divisor is 0public static long parseUnsignedLong(String s)
long
value represented by the given decimal string.NumberFormatException
 if the string does not contain a valid unsigned long
valueNullPointerException
 if s
is null
(in contrast to Long.parseLong(String)
)public static long decode(String stringValue)
long
value represented by the given string.
Accepts a decimal, hexadecimal, or octal number given by specifying the following prefix:
0x
HexDigits
0X
HexDigits
#
HexDigits
0
OctalDigits
NumberFormatException
 if the string does not contain a valid unsigned long
valuepublic static long parseUnsignedLong(String s, int radix)
long
value represented by a string with the given radix.s
 the string containing the unsigned long
representation to be parsed.radix
 the radix to use while parsing s
NumberFormatException
 if the string does not contain a valid unsigned long
with the given radix, or if radix
is not between Character.MIN_RADIX
and Character.MAX_RADIX
.NullPointerException
 if s
is null
(in contrast to Long.parseLong(String)
)public static String toString(long x)
public static String toString(long x, int radix)
x
for the given radix, where x
is treated
as unsigned.x
 the value to convert to a string.radix
 the radix to use while working with x
IllegalArgumentException
 if radix
is not between Character.MIN_RADIX
and Character.MAX_RADIX
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