cn.crane4j.core.util

类 ArrayUtils

java.lang.Object

cn.crane4j.core.util.ArrayUtils

public class ArrayUtils
extends Object

Array utils.

作者:

huangchengxing

构造器概要

构造器

构造器和说明
ArrayUtils()

方法概要

限定符和类型	方法和说明
static <T> T[]	append(T[] array, T... elements) Append elements to array and return a new array.
static <T> boolean	contains(T[] array, T target) Whether target is contained in array.
static <T> T	get(T[] array, int index) Get element from an array, return null if the array is null or index out of bounds.
static <T> T	getFirstNotNull(T... array) Get first a not null element from an array.
static boolean	isEmpty(Object[] array) Whether array is null or empty.
static <T,U> boolean	isEquals(T[] array1, U[] array2) Compare two arrays and return true if they are equal by Objects.equals(Object, Object).
static <T,U> boolean	isEquals(T[] array1, U[] array2, BiPredicate<T,U> predicate) Compare two arrays and return true if they are equal by predicate.
static boolean	isNotEmpty(Object[] array) Whether array is not null and not empty.
static String	join(String[] array, String delimiter) Join array to string with delimiter.
static <T> String	join(T[] array, Function<T,String> mapper, String delimiter) Join array to string with delimiter.
static <T> int	length(T[] array) Get length of an array, return 0 if the array is null.
static <T> Stream<T>	stream(T[] array) Get stream of array, return empty stream if array is null.

从类继承的方法 java.lang.Object

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

构造器详细资料

ArrayUtils

public ArrayUtils()

方法详细资料

getFirstNotNull

@SafeVarargs
public static <T> T getFirstNotNull(T... array)

Get first a not null element from an array.

类型参数:

T - element type

参数:

array - array

返回:

first not null element, null if array is null or all elements are null

append

@SafeVarargs
public static <T> T[] append(T[] array,
                                           T... elements)

Append elements to array and return a new array.

类型参数:

T - element type

参数:

array - array to append

elements - elements

返回:

new array with elements appended, if the array is null, return elements directly

isEmpty

public static boolean isEmpty(Object[] array)

Whether array is null or empty.

参数:

array - array

返回:

whether array is null or empty

isNotEmpty

public static boolean isNotEmpty(Object[] array)

Whether array is not null and not empty.

参数:

array - array

返回:

whether array is not null and not empty

join

public static <T> String join(T[] array,
                              Function<T,String> mapper,
                              String delimiter)

Join array to string with delimiter.

类型参数:

T - element type

参数:

array - array

mapper - mapper, map element to string

delimiter - delimiter

返回:

string joined with delimiter, empty string if array is null

join

public static String join(String[] array,
                          String delimiter)

Join array to string with delimiter.

参数:

array - array of string

delimiter - delimiter

返回:

string joined with delimiter, empty string if array is null

contains

public static <T> boolean contains(T[] array,
                                   T target)

Whether target is contained in array.

类型参数:

T - type of array

参数:

array - array, null returns false

target - target

返回:

whether target is contained in array

stream

public static <T> Stream<T> stream(T[] array)

Get stream of array, return empty stream if array is null.

类型参数:

T - type of array

参数:

array - array

返回:

stream of array

get

public static <T> T get(T[] array,
                        int index)

Get element from an array, return null if the array is null or index out of bounds.

类型参数:

T - type of array

参数:

array - array

index - index

返回:

element

length

public static <T> int length(T[] array)

Get length of an array, return 0 if the array is null.

类型参数:

T - type of array

参数:

array - array

返回:

length of array

isEquals

public static <T,U> boolean isEquals(T[] array1,
                                     U[] array2)

Compare two arrays and return true if they are equal by Objects.equals(Object, Object).

类型参数:

T - type of array1

U - type of array2

参数:

array1 - array1

array2 - array2

返回:

true if they are equal

isEquals

public static <T,U> boolean isEquals(T[] array1,
                                     U[] array2,
                                     BiPredicate<T,U> predicate)

Compare two arrays and return true if they are equal by predicate.

类型参数:

T - type of array1

U - type of array2

参数:

array1 - array1

array2 - array2

predicate - predicate to compare

返回:

true if they are equal