Class ArrayUtils


  • public class ArrayUtils
    extends Object
    Copied from Apache Commons Lang (including the @since tags.)
    • Constructor Detail

      • ArrayUtils

        public ArrayUtils()
    • Method Detail

      • 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 is null
        Throws:
        IllegalArgumentException - if the object argument is not an array.
        Since:
        2.1
      • 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 be null
        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 is null.
        Since:
        2.1