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> List<T>	duplicate(Collection<T> list)
static <T,R> List<R>	duplicate(Collection<T> list, Function<T,R> mapper) Returns the duplicates elements for list
static <T> List<T>	filter(List<T> list, Predicate<T> predicate)
static <T> T	get(List<T> list, int index)
static <T> T	get(T[] array, int index)
static <T> T	getFirst(Collection<T> values) Gets the first element for values
static <T> T	getLast(Collection<T> values) Gets the last element for values
static <T> T[]	newArray(Class<? extends T[]> newType, int length)
static <E> LinkedList<E>	newLinkedList(E element)
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).
static <T> T[]	toArray(T... args)

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

newLinkedList

public static <E> LinkedList<E> newLinkedList(E element)

toArray

public static <T> T[] toArray(T... args)

duplicate

public static <T> List<T> duplicate(Collection<T> list)

duplicate

public static <T,R> List<R> duplicate(Collection<T> list,
                                      Function<T,R> mapper)

Returns the duplicates elements for list

参数:

list - the list

返回:

a set of duplicates elements for list

getFirst

public static <T> T getFirst(Collection<T> values)

Gets the first element for values

类型参数:

T - the values element type

参数:

values - the values

返回:

first element of values

getLast

public static <T> T getLast(Collection<T> values)

Gets the last element for values

类型参数:

T - the values element type

参数:

values - the values

返回:

last element of values

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

filter

public static <T> List<T> filter(List<T> list,
                                 Predicate<T> predicate)

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)