Class Shorts

java.lang.Object
com.google.common.primitives.Shorts
@GwtCompatible(emulated=true) public final class Shorts extends Object
Static utility methods pertaining to short primitives, that are not already found in either Short or Arrays.

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 int
    BYTES
    The number of bytes required to represent a primitive short value.
    static final short
    MAX_POWER_OF_TWO
    The largest power of two that can be represented as a short.

  • Method Summary

    Modifier and Type
    Method
    Description
    static List<Short>
    asList(short... backingArray)
    Returns a fixed-size list backed by the specified array, similar to Arrays.asList(Object[]).
    static short
    checkedCast(long value)
    Returns the short value that is equal to value, if possible.
    static int
    compare(short a, short b)
    Compares the two specified short values.
    static short[]
    concat(short[]... arrays)
    Returns the values from each provided array combined into a single array.
    static short
    constrainToRange(short value, short min, short max)
    Returns the value nearest to value which is within the closed range [min..max].
    static boolean
    contains(short[] array, short target)
    Returns true if target is present as an element anywhere in array.
    static short[]
    ensureCapacity(short[] array, int minLength, int padding)
    Returns an array containing the same values as array, but guaranteed to be of a specified minimum length.
    static short
    fromByteArray(byte[] bytes)
    Returns the short value whose big-endian representation is stored in the first 2 bytes of bytes; equivalent to ByteBuffer.wrap(bytes).getShort().
    static short
    fromBytes(byte b1, byte b2)
    Returns the short value whose byte representation is the given 2 bytes, in big-endian order; equivalent to Shorts.fromByteArray(new byte[] {b1, b2}).
    static int
    hashCode(short value)
    Returns a hash code for value; equal to the result of invoking ((Short) value).hashCode().
    static int
    indexOf(short[] array, short target)
    Returns the index of the first appearance of the value target in array.
    static int
    indexOf(short[] array, short[] target)
    Returns the start position of the first occurrence of the specified target within array, or -1 if there is no such occurrence.
    static String
    join(String separator, short... array)
    Returns a string containing the supplied short values separated by separator.
    static int
    lastIndexOf(short[] array, short target)
    Returns the index of the last appearance of the value target in array.
    static Comparator<short[]>
    lexicographicalComparator()
    Returns a comparator that compares two short arrays lexicographically.
    static short
    max(short... array)
    Returns the greatest value present in array.
    static short
    min(short... array)
    Returns the least value present in array.
    static void
    reverse(short[] array)
    Reverses the elements of array.
    static void
    reverse(short[] array, int fromIndex, int toIndex)
    Reverses the elements of array between fromIndex inclusive and toIndex exclusive.
    static void
    rotate(short[] array, int distance)
    Performs a right rotation of array of "distance" places, so that the first element is moved to index "distance", and the element at index i ends up at index (distance + i) mod array.length.
    static void
    rotate(short[] array, int distance, int fromIndex, int toIndex)
    Performs a right rotation of array between fromIndex inclusive and toIndex exclusive.
    static short
    saturatedCast(long value)
    Returns the short nearest in value to value.
    static void
    sortDescending(short[] array)
    Sorts the elements of array in descending order.
    static void
    sortDescending(short[] array, int fromIndex, int toIndex)
    Sorts the elements of array between fromIndex inclusive and toIndex exclusive in descending order.
    static Converter<String,Short>
    stringConverter()
    Returns a serializable converter object that converts between strings and shorts using Short.decode(java.lang.String) and Short.toString().
    static short[]
    toArray(Collection<? extends Number> collection)
    Returns an array containing each value of collection, converted to a short value in the manner of Number.shortValue().
    static byte[]
    toByteArray(short value)
    Returns a big-endian representation of value in a 2-element byte array; equivalent to ByteBuffer.allocate(2).putShort(value).array().

    Methods inherited from class java.lang.Object

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

  • Field Details

  • Method Details

    • hashCode

      public static int hashCode(short value)
      Returns a hash code for value; equal to the result of invoking ((Short) value).hashCode().

      Java 8+ users: use Short.hashCode(short) instead.

      Parameters:
      value - a primitive short value
      Returns:
      a hash code for the value

    • checkedCast

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

    • saturatedCast

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

    • compare

      @InlineMe(replacement="Short.compare(a, b)") public static int compare(short a, short b)
      Compares the two specified short values. The sign of the value returned is the same as that of ((Short) a).compareTo(b).

      Note: this method is now unnecessary and should be treated as deprecated; use the equivalent Short.compare(short, short) method instead.

      Parameters:
      a - the first short to compare
      b - the second short 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

    • contains

      public static boolean contains(short[] array, short target)
      Returns true if target is present as an element anywhere in array.
      Parameters:
      array - an array of short values, possibly empty
      target - a primitive short value
      Returns:
      true if array[i] == target for some value of i

    • indexOf

      public static int indexOf(short[] array, short target)
      Returns the index of the first appearance of the value target in array.
      Parameters:
      array - an array of short values, possibly empty
      target - a primitive short value
      Returns:
      the least index i for which array[i] == target, or -1 if no such index exists.

    • indexOf

      public static int indexOf(short[] array, short[] target)
      Returns the start position of the first occurrence of the specified target within array, or -1 if there is no such occurrence.

      More formally, returns the lowest index i such that Arrays.copyOfRange(array, i, i + target.length) contains exactly the same elements as target.

      Parameters:
      array - the array to search for the sequence target
      target - the array to search for as a sub-sequence of array

    • lastIndexOf

      public static int lastIndexOf(short[] array, short target)
      Returns the index of the last appearance of the value target in array.
      Parameters:
      array - an array of short values, possibly empty
      target - a primitive short value
      Returns:
      the greatest index i for which array[i] == target, or -1 if no such index exists.

    • min

      @GwtIncompatible("Available in GWT! Annotation is to avoid conflict with GWT specialization of base class.") public static short min(short... array)
      Returns the least value present in array.
      Parameters:
      array - a nonempty array of short 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

      @GwtIncompatible("Available in GWT! Annotation is to avoid conflict with GWT specialization of base class.") public static short max(short... array)
      Returns the greatest value present in array.
      Parameters:
      array - a nonempty array of short 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

    • constrainToRange

      public static short constrainToRange(short value, short min, short max)
      Returns the value nearest to value which is within the closed range [min..max].

      If value is within the range [min..max], value is returned unchanged. If value is less than min, min is returned, and if value is greater than max, max is returned.

      Parameters:
      value - the short value to constrain
      min - the lower bound (inclusive) of the range to constrain value to
      max - the upper bound (inclusive) of the range to constrain value to
      Throws:
      IllegalArgumentException - if min > max
      Since:
      21.0

    • concat

      public static short[] concat(short[]... arrays)
      Returns the values from each provided array combined into a single array. For example, concat(new short[] {a, b}, new short[] {}, new short[] {c} returns the array {a, b, c}.
      Parameters:
      arrays - zero or more short arrays
      Returns:
      a single array containing all the values from the source arrays, in order
      Throws:
      IllegalArgumentException - if the total number of elements in arrays does not fit in an int

    • toByteArray

      @GwtIncompatible public static byte[] toByteArray(short value)
      Returns a big-endian representation of value in a 2-element byte array; equivalent to ByteBuffer.allocate(2).putShort(value).array(). For example, the input value (short) 0x1234 would yield the byte array {0x12, 0x34}.

      If you need to convert and concatenate several values (possibly even of different types), use a shared ByteBuffer instance, or use ByteStreams.newDataOutput() to get a growable buffer.

    • fromByteArray

      @GwtIncompatible public static short fromByteArray(byte[] bytes)
      Returns the short value whose big-endian representation is stored in the first 2 bytes of bytes; equivalent to ByteBuffer.wrap(bytes).getShort(). For example, the input byte array {0x54, 0x32} would yield the short value 0x5432.

      Arguably, it's preferable to use ByteBuffer; that library exposes much more flexibility at little cost in readability.

      Throws:
      IllegalArgumentException - if bytes has fewer than 2 elements

    • fromBytes

      @GwtIncompatible public static short fromBytes(byte b1, byte b2)
      Returns the short value whose byte representation is the given 2 bytes, in big-endian order; equivalent to Shorts.fromByteArray(new byte[] {b1, b2}).
      Since:
      7.0

    • stringConverter

      public static Converter<String,Short> stringConverter()
      Returns a serializable converter object that converts between strings and shorts using Short.decode(java.lang.String) and Short.toString(). The returned converter throws NumberFormatException if the input string is invalid.

      Warning: please see Short.decode(java.lang.String) to understand exactly how strings are parsed. For example, the string "0123" is treated as octal and converted to the value 83.

      Since:
      16.0

    • ensureCapacity

      public static short[] ensureCapacity(short[] array, int minLength, int padding)
      Returns an array containing the same values as array, but guaranteed to be of a specified minimum length. If array already has a length of at least minLength, it is returned directly. Otherwise, a new array of size minLength + padding is returned, containing the values of array, and zeroes in the remaining places.
      Parameters:
      array - the source array
      minLength - the minimum length the returned array must guarantee
      padding - an extra amount to "grow" the array by if growth is necessary
      Returns:
      an array containing the values of array, with guaranteed minimum length minLength
      Throws:
      IllegalArgumentException - if minLength or padding is negative

    • join

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

    • lexicographicalComparator

      public static Comparator<short[]> lexicographicalComparator()
      Returns a comparator that compares two short arrays lexicographically. That is, it compares, using compare(short, short)), 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, [] < [(short) 1] < [(short) 1, (short) 2] < [(short) 2].

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

      Since:
      2.0

    • sortDescending

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

    • sortDescending

      public static void sortDescending(short[] array, int fromIndex, int toIndex)
      Sorts the elements of array between fromIndex inclusive and toIndex exclusive in descending order.
      Since:
      23.1

    • reverse

      public static void reverse(short[] array)
      Reverses the elements of array. This is equivalent to Collections.reverse(Shorts.asList(array)), but is likely to be more efficient.
      Since:
      23.1

    • reverse

      public static void reverse(short[] array, int fromIndex, int toIndex)
      Reverses the elements of array between fromIndex inclusive and toIndex exclusive. This is equivalent to Collections.reverse(Shorts.asList(array).subList(fromIndex, toIndex)), but is likely to be more efficient.
      Throws:
      IndexOutOfBoundsException - if fromIndex < 0, toIndex > array.length, or toIndex > fromIndex
      Since:
      23.1

    • rotate

      public static void rotate(short[] array, int distance)
      Performs a right rotation of array of "distance" places, so that the first element is moved to index "distance", and the element at index i ends up at index (distance + i) mod array.length. This is equivalent to Collections.rotate(Shorts.asList(array), distance), but is considerably faster and avoids allocation and garbage collection.

      The provided "distance" may be negative, which will rotate left.

      Since:
      32.0.0

    • rotate

      public static void rotate(short[] array, int distance, int fromIndex, int toIndex)
      Performs a right rotation of array between fromIndex inclusive and toIndex exclusive. This is equivalent to Collections.rotate(Shorts.asList(array).subList(fromIndex, toIndex), distance), but is considerably faster and avoids allocations and garbage collection.

      The provided "distance" may be negative, which will rotate left.

      Throws:
      IndexOutOfBoundsException - if fromIndex < 0, toIndex > array.length, or toIndex > fromIndex
      Since:
      32.0.0

    • toArray

      public static short[] toArray(Collection<? extends Number> collection)
      Returns an array containing each value of collection, converted to a short value in the manner of Number.shortValue().

      Elements are copied from the argument collection as if by collection.toArray(). Calling this method is as thread-safe as calling that method.

      Parameters:
      collection - a collection of Number instances
      Returns:
      an array containing the same values as collection, in the same order, converted to primitives
      Throws:
      NullPointerException - if collection or any of its elements is null
      Since:
      1.0 (parameter was Collection<Short> before 12.0)

    • asList

      public static List<Short> asList(short... backingArray)
      Returns a fixed-size list backed by the specified array, similar to Arrays.asList(Object[]). The list supports List.set(int, Object), but any attempt to set a value to null will result in a NullPointerException.

      The returned list maintains the values, but not the identities, of Short objects written to or read from it. For example, whether list.get(0) == list.get(0) is true for the returned list is unspecified.

      The returned list is serializable.

      Parameters:
      backingArray - the array to back the list
      Returns:
      a list view of the array