程序包 net.dongliu.commons.collection

类 Collections2

java.lang.Object

net.dongliu.commons.collection.Collections2

public class Collections2
extends java.lang.Object

Util method for Collection.

构造器概要

构造器

构造器	说明
Collections2()

方法概要

修饰符和类型	方法	说明
static <S,T> java.util.List<T>	convertToList(java.util.Collection<S> c, java.util.function.Function<? super S,? extends T> mapper)	Convert origin collection to new immutable List, with elements mapped by mapper.
static <T> void	forEach(java.util.Collection<T> c, LastAwareConsumer<? super T> consumer)	Traverse on a collection.
static <T> void	forEachIndexed(java.util.Collection<T> c, IndexedConsumer<? super T> consumer)	Traverse on a collection, with element index.
static <T> PartitionResult<java.util.List<T>>	partitionToList(java.util.Collection<T> list, java.util.function.Predicate<? super T> predicate)	Divide collection to two immutable list, the first list contains elements accepted by predicate, the other contains other elements.
static <T> T[]	toArray(java.util.Collection<? extends T> c, java.util.function.IntFunction<T[]> maker)	已过时。 using Collection.toArray(IntFunction)

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

Collections2

public Collections2()

方法详细资料

toArray

@Deprecated
public static <T> T[] toArray(java.util.Collection<? extends T> c,
                              java.util.function.IntFunction<T[]> maker)

已过时。

using Collection.toArray(IntFunction)

Convert collection to array. This method using method reference, work better than the API in Collection. Call this method as:

     List<String> list = Lists.of("1", "2", "3");
     String[] array = Collections2.toArray(list, String[]::new);
 

类型参数:

T - element type

参数:

c - the collection

maker - create the target array

返回:

the target array containing elements in collection

convertToList

public static <S,T> java.util.List<T> convertToList(java.util.Collection<S> c,
                                                          java.util.function.Function<? super S,? extends T> mapper)

Convert origin collection to new immutable List, with elements mapped by mapper.

返回:

list contains the result.

partitionToList

public static <T> PartitionResult<java.util.List<T>> partitionToList(java.util.Collection<T> list,
                                                                     java.util.function.Predicate<? super T> predicate)

Divide collection to two immutable list, the first list contains elements accepted by predicate, the other contains other elements.

参数:

list - can not be null

返回:

two list

forEach

public static <T> void forEach(java.util.Collection<T> c,
                               LastAwareConsumer<? super T> consumer)

Traverse on a collection.

类型参数:

T - the data type

参数:

c - the collection

consumer - the consumer

forEachIndexed

public static <T> void forEachIndexed(java.util.Collection<T> c,
                                      IndexedConsumer<? super T> consumer)

Traverse on a collection, with element index.

类型参数:

T - the data type

参数:

c - the collection

consumer - the consumer