程序包 plus.hiver.common.utils.collection

类 CollectionUtils

java.lang.Object

plus.hiver.common.utils.collection.CollectionUtils

public class CollectionUtils
extends Object

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作者:

Yazhi Li

构造器概要

构造器

构造器	说明
CollectionUtils()

方法概要

修饰符和类型	方法	说明
static <T> void	addIfNotNull(Collection<T> coll, T item)
static String	concat(String[] source, String split)
static boolean	containsAny(Object source, Object... targets)
static boolean	containsAny(Collection<?> source, Collection<?> candidates)
static <T, U> List<U>	convertList(Collection<T> from, Function<T,U> func)
static <T, U> List<U>	convertList(Collection<T> from, Function<T,U> func, Predicate<T> filter)
static <T, K> Map<K,T>	convertMap(Collection<T> from, Function<T,K> keyFunc)
static <T, K, V> Map<K,V>	convertMap(Collection<T> from, Function<T,K> keyFunc, Function<T,V> valueFunc)
static <T, K, V> Map<K,V>	convertMap(Collection<T> from, Function<T,K> keyFunc, Function<T,V> valueFunc, BinaryOperator<V> mergeFunction)
static <T, K, V> Map<K,V>	convertMap(Collection<T> from, Function<T,K> keyFunc, Function<T,V> valueFunc, BinaryOperator<V> mergeFunction, Supplier<? extends Map<K,V>> supplier)
static <T, K, V> Map<K,V>	convertMap(Collection<T> from, Function<T,K> keyFunc, Function<T,V> valueFunc, Supplier<? extends Map<K,V>> supplier)
static <T, K> Map<K,T>	convertMap(Collection<T> from, Function<T,K> keyFunc, Supplier<? extends Map<K,T>> supplier)
static <T, K> Map<K,List<T>>	convertMultiMap(Collection<T> from, Function<T,K> keyFunc)
static <T, K, V> Map<K,List<V>>	convertMultiMap(Collection<T> from, Function<T,K> keyFunc, Function<T,V> valueFunc)
static <T, K, V> Map<K,Set<V>>	convertMultiMap2(Collection<T> from, Function<T,K> keyFunc, Function<T,V> valueFunc)
static <T, U> Set<U>	convertSet(Collection<T> from, Function<T,U> func)
static <T, U> Set<U>	convertSet(Collection<T> from, Function<T,U> func, Predicate<T> filter)
static String[]	copy(String[] source)
static <T, R> List<T>	distinct(Collection<T> from, Function<T,R> keyMapper)
static <T, R> List<T>	distinct(Collection<T> from, Function<T,R> keyMapper, BinaryOperator<T> cover)
static <T> List<T>	filterList(Collection<T> from, Predicate<T> predicate)
static <T> T	findFirst(List<T> from, Predicate<T> predicate)
static <T> T	getFirst(List<T> from)
static <T, V extends Comparable<? super V>> V	getMaxValue(List<T> from, Function<T,V> valueFunc)
static <T, V extends Comparable<? super V>> V	getMinValue(List<T> from, Function<T,V> valueFunc)
static <T, V extends Comparable<? super V>> V	getSumValue(List<T> from, Function<T,V> valueFunc, BinaryOperator<V> accumulator)
static boolean	isAnyEmpty(Collection<?>... collections)
static boolean	isEmpty(String[] source)
static <T> Collection<T>	singleton(T deptId)

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

CollectionUtils

public CollectionUtils()

方法详细资料

copy

public static String[] copy(String[] source)

concat

public static String concat(String[] source,
 String split)

isEmpty

public static boolean isEmpty(String[] source)

containsAny

public static boolean containsAny(Object source,
 Object... targets)

isAnyEmpty

public static boolean isAnyEmpty(Collection<?>... collections)

filterList

public static <T> List<T> filterList(Collection<T> from,
 Predicate<T> predicate)

distinct

public static <T,
R> List<T> distinct(Collection<T> from,
 Function<T,R> keyMapper)

distinct

public static <T,
R> List<T> distinct(Collection<T> from,
 Function<T,R> keyMapper,
 BinaryOperator<T> cover)

convertList

public static <T,
U> List<U> convertList(Collection<T> from,
 Function<T,U> func)

convertList

public static <T,
U> List<U> convertList(Collection<T> from,
 Function<T,U> func,
 Predicate<T> filter)

convertSet

public static <T,
U> Set<U> convertSet(Collection<T> from,
 Function<T,U> func)

convertSet

public static <T,
U> Set<U> convertSet(Collection<T> from,
 Function<T,U> func,
 Predicate<T> filter)

convertMap

public static <T,
K> Map<K,T> convertMap(Collection<T> from,
 Function<T,K> keyFunc)

convertMap

public static <T,
K> Map<K,T> convertMap(Collection<T> from,
 Function<T,K> keyFunc,
 Supplier<? extends Map<K,T>> supplier)

convertMap

public static <T,
K,
V> Map<K,V> convertMap(Collection<T> from,
 Function<T,K> keyFunc,
 Function<T,V> valueFunc)

convertMap

public static <T,
K,
V> Map<K,V> convertMap(Collection<T> from,
 Function<T,K> keyFunc,
 Function<T,V> valueFunc,
 BinaryOperator<V> mergeFunction)

convertMap

public static <T,
K,
V> Map<K,V> convertMap(Collection<T> from,
 Function<T,K> keyFunc,
 Function<T,V> valueFunc,
 Supplier<? extends Map<K,V>> supplier)

convertMap

public static <T,
K,
V> Map<K,V> convertMap(Collection<T> from,
 Function<T,K> keyFunc,
 Function<T,V> valueFunc,
 BinaryOperator<V> mergeFunction,
 Supplier<? extends Map<K,V>> supplier)

convertMultiMap

public static <T,
K> Map<K,List<T>> convertMultiMap(Collection<T> from,
 Function<T,K> keyFunc)

convertMultiMap

public static <T,
K,
V> Map<K,List<V>> convertMultiMap(Collection<T> from,
 Function<T,K> keyFunc,
 Function<T,V> valueFunc)

convertMultiMap2

public static <T,
K,
V> Map<K,Set<V>> convertMultiMap2(Collection<T> from,
 Function<T,K> keyFunc,
 Function<T,V> valueFunc)

containsAny

public static boolean containsAny(Collection<?> source,
 Collection<?> candidates)

getFirst

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

findFirst

public static <T> T findFirst(List<T> from,
 Predicate<T> predicate)

getMaxValue

public static <T,
V extends Comparable<? super V>> V getMaxValue(List<T> from,
 Function<T,V> valueFunc)

getMinValue

public static <T,
V extends Comparable<? super V>> V getMinValue(List<T> from,
 Function<T,V> valueFunc)

getSumValue

public static <T,
V extends Comparable<? super V>> V getSumValue(List<T> from,
 Function<T,V> valueFunc,
 BinaryOperator<V> accumulator)

addIfNotNull

public static <T> void addIfNotNull(Collection<T> coll,
 T item)

singleton

public static <T> Collection<T> singleton(T deptId)