java.lang.Object
- com.google.common.primitives.UnsignedLongs

```
@Beta
@GwtCompatible
public final class UnsignedLongs
extends java.lang.Object
```
Static utility methods pertaining to 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.

Since:

10.0

Nested Class Summary

Nested Classes
Modifier and Type Class Description

(package private) static class UnsignedLongs.LexicographicalComparator

Field Summary

Fields
Modifier and Type Field Description

static long MAX_VALUE

private static int[] maxSafeDigits

private static long[] maxValueDivs

private static int[] maxValueMods

Constructor Summary

Constructors
Modifier Constructor Description

private UnsignedLongs()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	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(java.lang.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.
`private static long`	`flip(long a)`	A (self-inverse) bijection which converts the ordering on unsigned longs to the ordering on longs, that is, `a <= b` as unsigned longs if and only if `flip(a) <= flip(b)` as signed longs.
`static java.lang.String`	`join(java.lang.String separator, long... array)`	Returns a string containing the supplied unsigned `long` values separated by `separator`.
`static java.util.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.
`private static boolean`	`overflowInParse(long current, int digit, int radix)`	Returns true if (current * radix) + digit is a number too large to be represented by an unsigned long.
`static long`	`parseUnsignedLong(java.lang.String string)`	Returns the unsigned `long` value represented by the given decimal string.
`static long`	`parseUnsignedLong(java.lang.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 java.lang.String`	`toString(long x)`	Returns a string representation of x, where x is treated as unsigned.
`static java.lang.String`	`toString(long x, int radix)`	Returns a string representation of `x` for the given radix, where `x` is treated as unsigned.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - MAX_VALUE
```
public static final long MAX_VALUE
```
    See Also:
    
    Constant Field Values
  - maxValueDivs
```
private static final long[] maxValueDivs
```
  - maxValueMods
```
private static final int[] maxValueMods
```
  - maxSafeDigits
```
private static final int[] maxSafeDigits
```
- Constructor Detail
  - UnsignedLongs
```
private UnsignedLongs()
```
- Method Detail
  - flip
```
private static long flip(long a)
```
    A (self-inverse) bijection which converts the ordering on unsigned longs to the ordering on longs, that is, a <= b as unsigned longs if and only if flip(a) <= flip(b) as signed longs.
  - compare
```
public 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.
    
    Parameters:
    
    a - the first unsigned long to compare
    
    b - the second unsigned long to compare
    
    Returns:
    
    a negative value if a is less than b; a positive value if a is greater than b; or zero if they are equal
  - min
```
public static long min(long... array)
```
    Returns the least value present in array, treating values as unsigned.
    
    Parameters:
    
    array - a nonempty array of unsigned long values
    
    Returns:
    
    the value present in array that is less than or equal to every other value in the array according to compare(long, long)
    
    Throws:
    
    java.lang.IllegalArgumentException - if array is empty
  - max
```
public static long max(long... array)
```
    Returns the greatest value present in array, treating values as unsigned.
    
    Parameters:
    
    array - a nonempty array of unsigned long values
    
    Returns:
    
    the value present in array that is greater than or equal to every other value in the array according to compare(long, long)
    
    Throws:
    
    java.lang.IllegalArgumentException - if array is empty
  - join
```
public static java.lang.String join(java.lang.String separator,
                                    long... array)
```
    Returns a string containing the supplied unsigned long values separated by separator. For example, join("-", 1, 2, 3) returns the string "1-2-3".
    
    Parameters:
    
    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 empty
  - lexicographicalComparator
```
public static java.util.Comparator<long[]> lexicographicalComparator()
```
    Returns a comparator that compares two arrays of unsigned 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[]).
  - divide
```
public static long divide(long dividend,
                          long divisor)
```
    Returns dividend / divisor, where the dividend and divisor are treated as unsigned 64-bit quantities.
    
    Parameters:
    
    dividend - the dividend (numerator)
    
    divisor - the divisor (denominator)
    
    Throws:
    
    java.lang.ArithmeticException - if divisor is 0
  - remainder
```
public static long remainder(long dividend,
                             long divisor)
```
    Returns dividend % divisor, where the dividend and divisor are treated as unsigned 64-bit quantities.
    
    Parameters:
    
    dividend - the dividend (numerator)
    
    divisor - the divisor (denominator)
    
    Throws:
    
    java.lang.ArithmeticException - if divisor is 0
    
    Since:
    
    11.0
  - parseUnsignedLong
```
public static long parseUnsignedLong(java.lang.String string)
```
    Returns the unsigned long value represented by the given decimal string.
    
    Throws:
    
    java.lang.NumberFormatException - if the string does not contain a valid unsigned long value
    
    java.lang.NullPointerException - if string is null (in contrast to Long.parseLong(String))
  - decode
```
public static long decode(java.lang.String stringValue)
```
    Returns the unsigned long value represented by the given string. Accepts a decimal, hexadecimal, or octal number given by specifying the following prefix:
    
    0xHexDigits
    0XHexDigits
    #HexDigits
    0OctalDigits
    Throws:
    
    java.lang.NumberFormatException - if the string does not contain a valid unsigned long value
    
    Since:
    
    13.0
  - parseUnsignedLong
```
public static long parseUnsignedLong(java.lang.String string,
                                     int radix)
```
    Returns the unsigned long value represented by a string with the given radix.
    
    Parameters:
    
    s - the string containing the unsigned long representation to be parsed.
    
    radix - the radix to use while parsing string
    
    Throws:
    
    java.lang.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.
    
    java.lang.NullPointerException - if string is null (in contrast to Long.parseLong(String))
  - overflowInParse
```
private static boolean overflowInParse(long current,
                                       int digit,
                                       int radix)
```
    Returns true if (current * radix) + digit is a number too large to be represented by an unsigned long. This is useful for detecting overflow while parsing a string representation of a number. Does not verify whether supplied radix is valid, passing an invalid radix will give undefined results or an ArrayIndexOutOfBoundsException.
  - toString
```
public static java.lang.String toString(long x)
```
    Returns a string representation of x, where x is treated as unsigned.
  - toString
```
public static java.lang.String toString(long x,
                                        int radix)
```
    Returns a string representation of x for the given radix, where x is treated as unsigned.
    
    Parameters:
    
    x - the value to convert to a string.
    
    radix - the radix to use while working with x
    
    Throws:
    
    java.lang.IllegalArgumentException - if radix is not between Character.MIN_RADIX and Character.MAX_RADIX.

Modifier and Type	Field	Description
`static long`	`MAX_VALUE`
`private static int[]`	`maxSafeDigits`
`private static long[]`	`maxValueDivs`
`private static int[]`	`maxValueMods`

Class UnsignedLongs

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

MAX_VALUE

maxValueDivs

maxValueMods

maxSafeDigits

Constructor Detail

UnsignedLongs

Method Detail

flip

compare

min

max

join

lexicographicalComparator

divide

remainder

parseUnsignedLong

decode

parseUnsignedLong

overflowInParse

toString

toString