Class SignedBytes

java.lang.Object
com.google.common.primitives.SignedBytes
@GwtCompatible public final class SignedBytes extends Object
Static utility methods pertaining to byte primitives that interpret values as signed. The corresponding methods that treat the values as unsigned are found in UnsignedBytes, 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

  • 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 a signed byte.

  • Method Summary

    Modifier and Type
    Method
    Description
    static byte
    checkedCast(long value)
    Returns the byte value that is equal to value, if possible.
    static int
    compare(byte a, byte b)
    Compares the two specified byte values.
    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.
    static byte
    min(byte... array)
    Returns the least value present in array.
    static byte
    saturatedCast(long value)
    Returns the byte nearest in value to value.
    static void
    sortDescending(byte[] array)
    Sorts the elements of array in descending order.
    static void
    sortDescending(byte[] array, int fromIndex, int toIndex)
    Sorts the elements of array between fromIndex inclusive and toIndex exclusive in descending order.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

  • Method Details

    • checkedCast

      public static byte checkedCast(long value)
      Returns the byte value that is equal to value, if possible.
      Parameters:
      value - any value in the range of the byte type
      Returns:
      the byte value that equals value
      Throws:
      IllegalArgumentException - if value is greater than Byte.MAX_VALUE or less than Byte.MIN_VALUE

    • saturatedCast

      public static byte saturatedCast(long value)
      Returns the byte nearest in value to value.
      Parameters:
      value - any long value
      Returns:
      the same value cast to byte if it is in the range of the byte type, Byte.MAX_VALUE if it is too large, or Byte.MIN_VALUE if it is too small

    • compare

      public static int compare(byte a, byte b)
      Compares the two specified byte values. The sign of the value returned is the same as that of ((Byte) a).compareTo(b).

      Note: this method behaves identically to Byte.compare(byte, byte).

      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.
      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
      Throws:
      IllegalArgumentException - if array is empty

    • max

      public static byte max(byte... array)
      Returns the greatest value present in array.
      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
      Throws:
      IllegalArgumentException - if array is empty

    • join

      public static String join(String separator, byte... array)
      Returns a string containing the supplied byte values separated by separator. For example, join(":", 0x01, 0x02, -0x01) returns the string "1:2:-1".
      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, 0x80] < [0x01, 0x7F] < [0x02]. Values are treated as signed.

      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

    • sortDescending

      public static void sortDescending(byte[] array)
      Sorts the elements of array in descending order.
      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.
      Since:
      23.1