@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 64-bit
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 string)
Returns the unsigned
long value represented by the given decimal string. |
static long |
parseUnsignedLong(String string,
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 64-bit
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 "1-2-3".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 string)
long value represented by the given decimal string.NumberFormatException - if the string does not contain a valid unsigned long
valueNullPointerException - if string 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:
0xHexDigits
0XHexDigits
#HexDigits
0OctalDigits
NumberFormatException - if the string does not contain a valid unsigned long
valuepublic static long parseUnsignedLong(String string, int radix)
long value represented by a string with the given radix.string - the string containing the unsigned long representation to be parsed.radix - the radix to use while parsing stringNumberFormatException - 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 string 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 xIllegalArgumentException - if radix is not between Character.MIN_RADIX
and Character.MAX_RADIX.Copyright © 2010–2017. All rights reserved.