net.gdface.utils

类 ArrayUtils

java.lang.Object

net.gdface.utils.ArrayUtils

public class ArrayUtils
extends java.lang.Object

方法概要

限定符和类型	方法和说明
static <T> T[]	addAll(T[] array1, T... array2) Adds all the elements of the given arrays into a new array.
static <T> T[]	cleanNull(T[] array) 清除array中为null的元素
static <T> T[]	clone(T[] array) Shallow clones an array returning a typecast result and handling null.
static boolean	hasNull(java.lang.Object... objects)
static int	indexOfFirstNull(java.lang.Object... objects) 返回第一个为null元素的索引,没找到返回-1,如果输入为null则返回-2

从类继承的方法 java.lang.Object

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

方法详细资料

cleanNull

public static final <T> T[] cleanNull(T[] array)

清除array中为null的元素

参数:

array - 输入的数组

返回:

如果 array为null或长度为0或array中没有null元素则返回array,否则返回新的不含null的数组

indexOfFirstNull

public static int indexOfFirstNull(java.lang.Object... objects)

返回第一个为null元素的索引,没找到返回-1,如果输入为null则返回-2

参数:

objects -

hasNull

public static boolean hasNull(java.lang.Object... objects)

参数:

objects -

返回:

true if any one of object is null or objects is null

addAll

public static <T> T[] addAll(T[] array1,
                             T... array2)

Adds all the elements of the given arrays into a new array.

The new array contains all of the element of array1 followed by all of the elements array2. When an array is returned, it is always a new array.

 ArrayUtils.addAll(null, null)     = null
 ArrayUtils.addAll(array1, null)   = cloned copy of array1
 ArrayUtils.addAll(null, array2)   = cloned copy of array2
 ArrayUtils.addAll([], [])         = []
 ArrayUtils.addAll([null], [null]) = [null, null]
 ArrayUtils.addAll(["a", "b", "c"], ["1", "2", "3"]) = ["a", "b", "c", "1", "2", "3"]
 

类型参数:

T - the component type of the array

参数:

array1 - the first array whose elements are added to the new array, may be null

array2 - the second array whose elements are added to the new array, may be null

返回:

The new array, null if both arrays are null. The type of the new array is the type of the first array, unless the first array is null, in which case the type is the same as the second array.

抛出:

java.lang.IllegalArgumentException - if the array types are incompatible

从以下版本开始:

2.1

clone

public static <T> T[] clone(T[] array)

Shallow clones an array returning a typecast result and handling null.

The objects in the array are not cloned, thus there is no special handling for multi-dimensional arrays.

This method returns null for a null input array.

类型参数:

T - the component type of the array

参数:

array - the array to shallow clone, may be null

返回:

the cloned array, null if null input