cn.ponfee.scheduler.common.util

类 Collects

java.lang.Object

cn.ponfee.scheduler.common.util.Collects

public class Collects
extends Object

Collection utilities

作者:

Ponfee

构造器概要

构造器

构造器和说明
Collects()

方法概要

限定符和类型	方法和说明
static <T> List<T>	concat(List<T> list, T... array)
static <S,T> List<T>	convert(List<S> source, Function<S,T> mapper)
static <T> T	get(List<T> list, int index)
static <T> T	get(T[] array, int index)
static <T> T	getFirst(List<T> list) Gets the first element for list
static <T> T	getLast(List<T> list) Gets the last element for list
static <T> T[]	newArray(Class<? extends T[]> newType, int length)
static List<int[]>	partition(int[] array, int size) Returns consecutive sub array of an array, each of the same size (the final list may be smaller).

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

Collects

public Collects()

方法详细资料

getFirst

public static <T> T getFirst(List<T> list)

Gets the first element for list

类型参数:

T - the list element type

参数:

list - the list

返回:

first element of list

getLast

public static <T> T getLast(List<T> list)

Gets the last element for list

类型参数:

T - the list element type

参数:

list - the list

返回:

last element of list

get

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

get

public static <T> T get(List<T> list,
                        int index)

partition

public static List<int[]> partition(int[] array,
                                    int size)

Returns consecutive sub array of an array, each of the same size (the final list may be smaller).

  Collects.partition(new int[]{1,1,2,5,3}, 1)    ->  [1, 1, 2, 5, 3]
  Collects.partition(new int[]{1,1,2,5,3}, 3)    ->  [1, 1]; [2, 5]; [3]
  Collects.partition(new int[]{1,1,2,5,3}, 5)    ->  [1]; [1]; [2]; [5]; [3]
  Collects.partition(new int[]{1,1,2,5,3}, 6)    ->  [1]; [1]; [2]; [5]; [3]
  Collects.partition(new int[]{1,1,2,5,3}, 100)  ->  [1]; [1]; [2]; [5]; [3]
 

参数:

array - the array

size - the size

返回:

a list of consecutive sub sets

convert

public static <S,T> List<T> convert(List<S> source,
                                    Function<S,T> mapper)

concat

@SafeVarargs
public static <T> List<T> concat(List<T> list,
                                              T... array)

newArray

public static <T> T[] newArray(Class<? extends T[]> newType,
                               int length)