public class Arrays extends Object
Modifier and Type | Method and Description |
---|---|
static <T> T[] |
array(T... values)
Returns an array containing the given arguments.
|
static <T> T[] |
copyOf(T[] original,
int newLength)
Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length.
|
static String |
format(Object array)
Returns the
String representation of the given array, or null if the given object is either
null or not an array. |
static <T> boolean |
hasOnlyNullElements(T[] array)
Returns
true if the given array has only null elements, false otherwise. |
static boolean |
isArray(Object o)
Returns
true if the given object is not null and is an array. |
static <T> boolean |
isEmpty(T[] array)
Returns
true if the given array is null or empty. |
static <T> T[] |
nonNullElements(T[] array)
Returns a new array containing the non-null elements of the given array.
|
public static boolean isArray(Object o)
true
if the given object is not null
and is an array.o
- the given object.true
if the given object is not null
and is an array, otherwise false
.public static <T> boolean isEmpty(T[] array)
true
if the given array is null
or empty.T
- the type of elements of the array.array
- the array to check.true
if the given array is null
or empty, otherwise false
.public static <T> T[] array(T... values)
T
- the type of the array to return.values
- the values to store in the array.public static String format(Object array)
String
representation of the given array, or null
if the given object is either
null
or not an array. This method supports arrays having other arrays as elements.array
- the object that is expected to be an array.String
representation of the given array.public static <T> T[] nonNullElements(T[] array)
null
elements or if it is empty. This method returns null
if the given array
is null
.T
- the type of elements of the array.array
- the array we want to extract the non-null elements from.null
if the given array is
null
.public static <T> boolean hasOnlyNullElements(T[] array)
true
if the given array has only null
elements, false
otherwise. If given array is
empty, this method returns true
.T
- the type of elements of the array.array
- the given array. It must not be null.true
if the given array has only null
elements or is empty, false
otherwise.NullPointerException
- if the given array is null
.public static <T> T[] copyOf(T[] original, int newLength)
null
. Such
indices will exist if and only if the specified length is greater than that of the original array.T
- the component type of the array.original
- the array to be copied.newLength
- the length of the copy to be returned.NegativeArraySizeException
- if newLength
is negative.NullPointerException
- if original
is null
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