Class UnsignedBytes

java.lang.Object
com.google.common.primitives.UnsignedBytes
@GwtIncompatible public final class UnsignedBytes extends Object
Static utility methods pertaining to byte primitives that interpret values as unsigned (that is, any negative value b is treated as the positive value 256 + b). The corresponding methods that treat the values as signed are found in SignedBytes, and the methods for which signedness is not an issue are in Bytes.

See the Guava User Guide article on primitive utilities.

Since:
1.0
Author:
Kevin Bourrillion, Martin Buchholz, Hiroshi Yamauchi, Louis Wasserman

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final byte
    MAX_POWER_OF_TWO
    The largest power of two that can be represented as an unsigned byte.
    static final byte
    MAX_VALUE
    The largest value that fits into an unsigned byte.

  • Method Summary

    Modifier and Type
    Method
    Description
    static byte
    checkedCast(long value)
    Returns the byte value that, when treated as unsigned, is equal to value, if possible.
    static int
    compare(byte a, byte b)
    Compares the two specified byte values, treating them as unsigned values between 0 and 255 inclusive.
    static String
    join(String separator, byte... array)
    Returns a string containing the supplied byte values separated by separator.
    static Comparator<byte[]>
    lexicographicalComparator()
    Returns a comparator that compares two byte arrays lexicographically.
    static byte
    max(byte... array)
    Returns the greatest value present in array, treating values as unsigned.
    static byte
    min(byte... array)
    Returns the least value present in array, treating values as unsigned.
    static byte
    parseUnsignedByte(String string)
    Returns the unsigned byte value represented by the given decimal string.
    static byte
    parseUnsignedByte(String string, int radix)
    Returns the unsigned byte value represented by a string with the given radix.
    static byte
    saturatedCast(long value)
    Returns the byte value that, when treated as unsigned, is nearest in value to value.
    static void
    sort(byte[] array)
    Sorts the array, treating its elements as unsigned bytes.
    static void
    sort(byte[] array, int fromIndex, int toIndex)
    Sorts the array between fromIndex inclusive and toIndex exclusive, treating its elements as unsigned bytes.
    static void
    sortDescending(byte[] array)
    Sorts the elements of array in descending order, interpreting them as unsigned 8-bit integers.
    static void
    sortDescending(byte[] array, int fromIndex, int toIndex)
    Sorts the elements of array between fromIndex inclusive and toIndex exclusive in descending order, interpreting them as unsigned 8-bit integers.
    static int
    toInt(byte value)
    Returns the value of the given byte as an integer, when treated as unsigned.
    static String
    toString(byte x)
    Returns a string representation of x, where x is treated as unsigned.
    static String
    toString(byte 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 Details

  • Method Details

    • toInt

      public static int toInt(byte value)
      Returns the value of the given byte as an integer, when treated as unsigned. That is, returns value + 256 if value is negative; value itself otherwise.

      Java 8+ users: use Byte.toUnsignedInt(byte) instead.

      Since:
      6.0

    • checkedCast

      @CanIgnoreReturnValue public static byte checkedCast(long value)
      Returns the byte value that, when treated as unsigned, is equal to value, if possible.
      Parameters:
      value - a value between 0 and 255 inclusive
      Returns:
      the byte value that, when treated as unsigned, equals value
      Throws:
      IllegalArgumentException - if value is negative or greater than 255

    • saturatedCast

      public static byte saturatedCast(long value)
      Returns the byte value that, when treated as unsigned, is nearest in value to value.
      Parameters:
      value - any long value
      Returns:
      (byte) 255 if value >= 255, (byte) 0 if value <= 0, and value cast to byte otherwise

    • compare

      public static int compare(byte a, byte b)
      Compares the two specified byte values, treating them as unsigned values between 0 and 255 inclusive. For example, (byte) -127 is considered greater than (byte) 127 because it is seen as having the value of positive 129.
      Parameters:
      a - the first byte to compare
      b - the second byte 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 byte min(byte... array)
      Returns the least value present in array, treating values as unsigned.
      Parameters:
      array - a nonempty array of byte values
      Returns:
      the value present in array that is less than or equal to every other value in the array according to compare(byte, byte)
      Throws:
      IllegalArgumentException - if array is empty

    • max

      public static byte max(byte... array)
      Returns the greatest value present in array, treating values as unsigned.
      Parameters:
      array - a nonempty array of byte values
      Returns:
      the value present in array that is greater than or equal to every other value in the array according to compare(byte, byte)
      Throws:
      IllegalArgumentException - if array is empty

    • toString

      public static String toString(byte x)
      Returns a string representation of x, where x is treated as unsigned.
      Since:
      13.0

    • toString

      public static String toString(byte 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:
      IllegalArgumentException - if radix is not between Character.MIN_RADIX and Character.MAX_RADIX.
      Since:
      13.0

    • parseUnsignedByte

      @CanIgnoreReturnValue public static byte parseUnsignedByte(String string)
      Returns the unsigned byte value represented by the given decimal string.
      Throws:
      NumberFormatException - if the string does not contain a valid unsigned byte value
      NullPointerException - if string is null (in contrast to Byte.parseByte(String))
      Since:
      13.0

    • parseUnsignedByte

      @CanIgnoreReturnValue public static byte parseUnsignedByte(String string, int radix)
      Returns the unsigned byte value represented by a string with the given radix.
      Parameters:
      string - the string containing the unsigned byte representation to be parsed.
      radix - the radix to use while parsing string
      Throws:
      NumberFormatException - if the string does not contain a valid unsigned byte 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 Byte.parseByte(String))
      Since:
      13.0

    • join

      public static String join(String separator, byte... array)
      Returns a string containing the supplied byte values separated by separator. For example, join(":", (byte) 1, (byte) 2, (byte) 255) returns the string "1:2:255".
      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 byte values, possibly empty

    • lexicographicalComparator

      public static Comparator<byte[]> lexicographicalComparator()
      Returns a comparator that compares two byte arrays lexicographically. That is, it compares, using compare(byte, byte)), 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, [] < [0x01] < [0x01, 0x7F] < [0x01, 0x80] < [0x02]. Values are treated as unsigned.

      The returned comparator is inconsistent with Object.equals(Object) (since arrays support only identity equality), but it is consistent with Arrays.equals(byte[], byte[]).

      Since:
      2.0

    • sort

      public static void sort(byte[] array)
      Sorts the array, treating its elements as unsigned bytes.
      Since:
      23.1

    • sort

      public static void sort(byte[] array, int fromIndex, int toIndex)
      Sorts the array between fromIndex inclusive and toIndex exclusive, treating its elements as unsigned bytes.
      Since:
      23.1

    • sortDescending

      public static void sortDescending(byte[] array)
      Sorts the elements of array in descending order, interpreting them as unsigned 8-bit integers.
      Since:
      23.1

    • sortDescending

      public static void sortDescending(byte[] array, int fromIndex, int toIndex)
      Sorts the elements of array between fromIndex inclusive and toIndex exclusive in descending order, interpreting them as unsigned 8-bit integers.
      Since:
      23.1