Floats (Guava: Google Core Libraries for Java 23.4-jre API)

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

```
@GwtCompatible(emulated=true)
public final class Floats
extends Object
```
Static utility methods pertaining to float primitives, that are not already found in either Float or Arrays.
See the Guava User Guide article on primitive utilities.

Since:

1.0

Author:

Kevin Bourrillion

Field Summary

Fields
Modifier and Type Field and Description

static int BYTES
The number of bytes required to represent a primitive float value.

Fields
Modifier and Type	Field and Description
`static int`	`BYTES` The number of bytes required to represent a primitive `float` value.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static List<Float>`	`asList(float... backingArray)` Returns a fixed-size list backed by the specified array, similar to `Arrays.asList(Object[])`.
`static int`	`compare(float a, float b)` Compares the two specified `float` values using `Float.compare(float, float)`.
`static float[]`	`concat(float[]... arrays)` Returns the values from each provided array combined into a single array.
`static float`	`constrainToRange(float value, float min, float max)` Returns the value nearest to `value` which is within the closed range `[min..max]`.
`static boolean`	`contains(float[] array, float target)` Returns `true` if `target` is present as an element anywhere in `array`.
`static float[]`	`ensureCapacity(float[] array, int minLength, int padding)` Returns an array containing the same values as `array`, but guaranteed to be of a specified minimum length.
`static int`	`hashCode(float value)` Returns a hash code for `value`; equal to the result of invoking `((Float) value).hashCode()`.
`static int`	`indexOf(float[] array, float target)` Returns the index of the first appearance of the value `target` in `array`.
`static int`	`indexOf(float[] array, float[] target)` Returns the start position of the first occurrence of the specified `target` within `array`, or `-1` if there is no such occurrence.
`static boolean`	`isFinite(float value)` Returns `true` if `value` represents a real number.
`static String`	`join(String separator, float... array)` Returns a string containing the supplied `float` values, converted to strings as specified by `Float.toString(float)`, and separated by `separator`.
`static int`	`lastIndexOf(float[] array, float target)` Returns the index of the last appearance of the value `target` in `array`.
`static Comparator<float[]>`	`lexicographicalComparator()` Returns a comparator that compares two `float` arrays lexicographically.
`static float`	`max(float... array)` Returns the greatest value present in `array`, using the same rules of comparison as `Math.max(float, float)`.
`static float`	`min(float... array)` Returns the least value present in `array`, using the same rules of comparison as `Math.min(float, float)`.
`static void`	`reverse(float[] array)` Reverses the elements of `array`.
`static void`	`reverse(float[] array, int fromIndex, int toIndex)` Reverses the elements of `array` between `fromIndex` inclusive and `toIndex` exclusive.
`static void`	`sortDescending(float[] array)` Sorts the elements of `array` in descending order.
`static void`	`sortDescending(float[] array, int fromIndex, int toIndex)` Sorts the elements of `array` between `fromIndex` inclusive and `toIndex` exclusive in descending order.
`static Converter<String,Float>`	`stringConverter()` Returns a serializable converter object that converts between strings and floats using `Float.valueOf(java.lang.String)` and `Float.toString()`.
`static float[]`	`toArray(Collection<? extends Number> collection)` Returns an array containing each value of `collection`, converted to a `float` value in the manner of `Number.floatValue()`.
`static Float`	`tryParse(String string)` Parses the specified string as a single-precision floating point value.

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

- Field Detail
  - BYTES
```
public static final int BYTES
```
    The number of bytes required to represent a primitive float value.
    Java 8 users: use Float.BYTES instead.
    
    Since:
    
    10.0
    
    See Also:
    
    Constant Field Values
- Method Detail
  - hashCode
```
public static int hashCode(float value)
```
    Returns a hash code for value; equal to the result of invoking ((Float) value).hashCode().
    Java 8 users: use Float.hashCode(float) instead.
    
    Parameters:
    
    value - a primitive float value
    
    Returns:
    
    a hash code for the value
  - compare
```
public static int compare(float a,
                          float b)
```
    Compares the two specified float values using Float.compare(float, float). You may prefer to invoke that method directly; this method exists only for consistency with the other utilities in this package.
    Note: this method simply delegates to the JDK method Float.compare(float, float). It is provided for consistency with the other primitive types, whose compare methods were not added to the JDK until JDK 7.
    
    Parameters:
    
    a - the first float to compare
    
    b - the second float to compare
    
    Returns:
    
    the result of invoking Float.compare(float, float)
  - isFinite
```
public static boolean isFinite(float value)
```
    Returns true if value represents a real number. This is equivalent to, but not necessarily implemented as, !(Float.isInfinite(value) || Float.isNaN(value)).
    Java 8 users: use Float.isFinite(float) instead.
    
    Since:
    
    10.0
  - contains
```
public static boolean contains(float[] array,
                               float target)
```
    Returns true if target is present as an element anywhere in array. Note that this always returns false when target is NaN.
    
    Parameters:
    
    array - an array of float values, possibly empty
    
    target - a primitive float value
    
    Returns:
    
    true if array[i] == target for some value of i
  - indexOf
```
public static int indexOf(float[] array,
                          float target)
```
    Returns the index of the first appearance of the value target in array. Note that this always returns -1 when target is NaN.
    
    Parameters:
    
    array - an array of float values, possibly empty
    
    target - a primitive float value
    
    Returns:
    
    the least index i for which array[i] == target, or -1 if no such index exists.
  - indexOf
```
public static int indexOf(float[] array,
                          float[] 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.
    Note that this always returns -1 when target contains NaN.
    
    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(float[] array,
                              float target)
```
    Returns the index of the last appearance of the value target in array. Note that this always returns -1 when target is NaN.
    
    Parameters:
    
    array - an array of float values, possibly empty
    
    target - a primitive float value
    
    Returns:
    
    the greatest index i for which array[i] == target, or -1 if no such index exists.
  - min
```
public static float min(float... array)
```
    Returns the least value present in array, using the same rules of comparison as Math.min(float, float).
    
    Parameters:
    
    array - a nonempty array of float 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 float max(float... array)
```
    Returns the greatest value present in array, using the same rules of comparison as Math.max(float, float).
    
    Parameters:
    
    array - a nonempty array of float 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
```
@Beta
public static float constrainToRange(float value,
                                           float min,
                                           float 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 float 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 float[] concat(float[]... arrays)
```
    Returns the values from each provided array combined into a single array. For example, concat(new float[] {a, b}, new float[] {}, new float[] {c} returns the array {a, b, c}.
    
    Parameters:
    
    arrays - zero or more float arrays
    
    Returns:
    
    a single array containing all the values from the source arrays, in order
  - stringConverter
```
@Beta
public static Converter<String,Float> stringConverter()
```
    Returns a serializable converter object that converts between strings and floats using Float.valueOf(java.lang.String) and Float.toString().
    
    Since:
    
    16.0
  - ensureCapacity
```
public static float[] ensureCapacity(float[] 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,
                          float... array)
```
    Returns a string containing the supplied float values, converted to strings as specified by Float.toString(float), and separated by separator. For example, join("-", 1.0f, 2.0f, 3.0f) returns the string "1.0-2.0-3.0".
    Note that Float.toString(float) formats float differently in GWT. In the previous example, it 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 float values, possibly empty
  - lexicographicalComparator
```
public static Comparator<float[]> lexicographicalComparator()
```
    Returns a comparator that compares two float arrays lexicographically. That is, it compares, using compare(float, float)), 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, [] < [1.0f] < [1.0f, 2.0f] < [2.0f].
    The returned comparator is inconsistent with Object.equals(Object) (since arrays support only identity equality), but it is consistent with Arrays.equals(float[], float[]).
    
    Since:
    
    2.0
  - sortDescending
```
public static void sortDescending(float[] array)
```
    Sorts the elements of array in descending order.
    Note that this method uses the total order imposed by Float.compare(float, float), which treats all NaN values as equal and 0.0 as greater than -0.0.
    
    Since:
    
    23.1
  - sortDescending
```
public static void sortDescending(float[] array,
                                  int fromIndex,
                                  int toIndex)
```
    Sorts the elements of array between fromIndex inclusive and toIndex exclusive in descending order.
    Note that this method uses the total order imposed by Float.compare(float, float), which treats all NaN values as equal and 0.0 as greater than -0.0.
    
    Since:
    
    23.1
  - reverse
```
public static void reverse(float[] array)
```
    Reverses the elements of array. This is equivalent to Collections.reverse(Floats.asList(array)), but is likely to be more efficient.
    
    Since:
    
    23.1
  - reverse
```
public static void reverse(float[] array,
                           int fromIndex,
                           int toIndex)
```
    Reverses the elements of array between fromIndex inclusive and toIndex exclusive. This is equivalent to Collections.reverse(Floats.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
  - toArray
```
public static float[] toArray(Collection<? extends Number> collection)
```
    Returns an array containing each value of collection, converted to a float value in the manner of Number.floatValue().
    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<Float> before 12.0)
  - asList
```
public static List<Float> asList(float... 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 Float 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 may have unexpected behavior if it contains NaN, or if NaN is used as a parameter to any of its methods.
    
    Parameters:
    
    backingArray - the array to back the list
    
    Returns:
    
    a list view of the array
  - tryParse
```
@Beta
 @Nullable
 @CheckForNull
 @GwtIncompatible
public static Float tryParse(String string)
```
    Parses the specified string as a single-precision floating point value. The ASCII character '-' ('\u002D') is recognized as the minus sign.
    Unlike Float.parseFloat(String), this method returns null instead of throwing an exception if parsing fails. Valid inputs are exactly those accepted by Float.valueOf(String), except that leading and trailing whitespace is not permitted.
    This implementation is likely to be faster than Float.parseFloat if many failures are expected.
    
    Parameters:
    
    string - the string representation of a float value
    
    Returns:
    
    the floating point value represented by string, or null if string has a length of zero or cannot be parsed as a float value
    
    Since:
    
    14.0

Class Floats

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

BYTES

Method Detail

hashCode

compare

isFinite

contains

indexOf

indexOf

lastIndexOf

min

max

constrainToRange

concat

stringConverter

ensureCapacity

join

lexicographicalComparator

sortDescending

sortDescending

reverse

reverse

toArray

asList

tryParse