Class ArrayUtils
- java.lang.Object
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- org.apache.logging.log4j.core.util.ArrayUtils
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public class ArrayUtils extends Object
Copied from Apache Commons Lang (including the@since
tags.)
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Constructor Summary
Constructors Constructor Description ArrayUtils()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static int
getLength(Object array)
Returns the length of the specified array.static <T> T[]
remove(T[] array, int index)
Removes the element at the specified position from the specified array.
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Method Detail
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getLength
public static int getLength(Object array)
Returns the length of the specified array. This method can deal with
Object
arrays and with primitive arrays.If the input array is
null
,0
is returned.ArrayUtils.getLength(null) = 0 ArrayUtils.getLength([]) = 0 ArrayUtils.getLength([null]) = 1 ArrayUtils.getLength([true, false]) = 2 ArrayUtils.getLength([1, 2, 3]) = 3 ArrayUtils.getLength(["a", "b", "c"]) = 3
- Parameters:
array
- the array to retrieve the length from, may be null- Returns:
- The length of the array, or
0
if the array isnull
- Throws:
IllegalArgumentException
- if the object argument is not an array.- Since:
- 2.1
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remove
public static <T> T[] remove(T[] array, int index)
Removes the element at the specified position from the specified array. All subsequent elements are shifted to the left (subtracts one from their indices).
This method returns a new array with the same elements of the input array except the element on the specified position. The component type of the returned array is always the same as that of the input array.
If the input array is
null
, an IndexOutOfBoundsException will be thrown, because in that case no valid index can be specified.ArrayUtils.remove(["a"], 0) = [] ArrayUtils.remove(["a", "b"], 0) = ["b"] ArrayUtils.remove(["a", "b"], 1) = ["a"] ArrayUtils.remove(["a", "b", "c"], 1) = ["a", "c"]
- Type Parameters:
T
- the component type of the array- Parameters:
array
- the array to remove the element from, may not benull
index
- the position of the element to be removed- Returns:
- A new array containing the existing elements except the element at the specified position.
- Throws:
IndexOutOfBoundsException
- if the index is out of range (index < 0 || index >= array.length), or if the array isnull
.- Since:
- 2.1
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