@Beta @GwtCompatible public final class UnsignedInts extends Object
int primitives that interpret values as
unsigned (that is, any negative value x is treated as the positive value
2^32 + x). The methods for which signedness is not an issue are in Ints, as well
as signed versions of methods for which signedness is an issue.
In addition, this class provides several static methods for converting an int to a
String and a String to an int that treat the int as an unsigned
number.
Users of these utilities must be extremely careful not to mix up signed and unsigned
int values. When possible, it is recommended that the UnsignedInteger 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 | Method and Description |
|---|---|
static int |
compare(int a,
int b)
Compares the two specified
int values, treating them as unsigned values between
0 and 2^32 - 1 inclusive. |
static int |
decode(String stringValue)
Returns the unsigned
int value represented by the given string. |
static int |
divide(int dividend,
int divisor)
Returns dividend / divisor, where the dividend and divisor are treated as unsigned 32-bit
quantities.
|
static String |
join(String separator,
int... array)
Returns a string containing the supplied unsigned
int values separated by
separator. |
static Comparator<int[]> |
lexicographicalComparator()
Returns a comparator that compares two arrays of unsigned
int values lexicographically. |
static int |
max(int... array)
Returns the greatest value present in
array, treating values as unsigned. |
static int |
min(int... array)
Returns the least value present in
array, treating values as unsigned. |
static int |
parseUnsignedInt(String s)
Returns the unsigned
int value represented by the given decimal string. |
static int |
parseUnsignedInt(String string,
int radix)
Returns the unsigned
int value represented by a string with the given radix. |
static int |
remainder(int dividend,
int divisor)
Returns dividend % divisor, where the dividend and divisor are treated as unsigned 32-bit
quantities.
|
static long |
toLong(int value)
Returns the value of the given
int as a long, when treated as unsigned. |
static String |
toString(int x)
Returns a string representation of x, where x is treated as unsigned.
|
static String |
toString(int x,
int radix)
Returns a string representation of
x for the given radix, where x is treated
as unsigned. |
@CheckReturnValue public static int compare(int a, int b)
int values, treating them as unsigned values between
0 and 2^32 - 1 inclusive.a - the first unsigned int to compareb - the second unsigned int to comparea is less than b; a positive value if a is
greater than b; or zero if they are equal@CheckReturnValue public static long toLong(int value)
int as a long, when treated as unsigned.@CheckReturnValue public static int min(int... array)
array, treating values as unsigned.array - a nonempty array of unsigned int valuesarray that is less than or equal to every other value in
the array according to compare(int, int)IllegalArgumentException - if array is empty@CheckReturnValue public static int max(int... array)
array, treating values as unsigned.array - a nonempty array of unsigned int valuesarray that is greater than or equal to every other value
in the array according to compare(int, int)IllegalArgumentException - if array is empty@CheckReturnValue public static String join(String separator, int... array)
int 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 int values, possibly empty@CheckReturnValue public static Comparator<int[]> lexicographicalComparator()
int values lexicographically.
That is, it compares, using compare(int, int)), 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, [] < [1] < [1, 2] < [2] < [1 << 31].
The returned comparator is inconsistent with Object.equals(Object) (since arrays
support only identity equality), but it is consistent with Arrays.equals(int[], int[]).
@CheckReturnValue public static int divide(int dividend, int divisor)
dividend - the dividend (numerator)divisor - the divisor (denominator)ArithmeticException - if divisor is 0@CheckReturnValue public static int remainder(int dividend, int divisor)
dividend - the dividend (numerator)divisor - the divisor (denominator)ArithmeticException - if divisor is 0public static int decode(String stringValue)
int 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 int valuepublic static int parseUnsignedInt(String s)
int value represented by the given decimal string.NumberFormatException - if the string does not contain a valid unsigned int valueNullPointerException - if s is null
(in contrast to Integer.parseInt(String))public static int parseUnsignedInt(String string, int radix)
int value represented by a string with the given radix.string - the string containing the unsigned integer representation to be parsed.radix - the radix to use while parsing s; must be between
Character.MIN_RADIX and Character.MAX_RADIX.NumberFormatException - if the string does not contain a valid unsigned int, or
if supplied radix is invalid.NullPointerException - if s is null
(in contrast to Integer.parseInt(String))@CheckReturnValue public static String toString(int x)
@CheckReturnValue public static String toString(int 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 © 2010-2015. All Rights Reserved.