程序包 cn.jrack.core.util.collection

类 CollectionUtil

java.lang.Object

cn.jrack.core.util.collection.CollectionUtil

public class CollectionUtil
extends Object

Collection 工具类

作者:

ZhaoYang

构造器概要

构造器

构造器	说明
CollectionUtil()

方法概要

修饰符和类型	方法	说明
static <T> void	addIfNotNull(Collection<T> coll, T item)
static boolean	containsAny(Object source, Object... targets)
static boolean	containsAny(Collection<?> source, Collection<?> candidates)
static <T, K> Map<K,T>	convertImmutableMap(Collection<T> from, Function<T,K> keyFunc)
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 <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 boolean	isAnyEmpty(Collection<?>... collections)
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

CollectionUtil

public CollectionUtil()

方法详细资料

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)

convertImmutableMap

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

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)

addIfNotNull

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

singleton

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