com.mybatisflex.core.util

类 CollectionUtil

java.lang.Object

com.mybatisflex.core.util.CollectionUtil

public class CollectionUtil
extends Object

构造器概要

构造器

限定符	构造器和说明
private	CollectionUtil()

方法概要

限定符和类型	方法和说明
static <E extends CloneSupport<E>> List<E>	cloneArrayList(List<E> list)
static <K,V> V	computeIfAbsent(Map<K,V> concurrentHashMap, K key, Function<? super K,? extends V> mappingFunction) 主要是用于修复 concurrentHashMap 在 jdk1.8 下的死循环问题
static boolean	isEmpty(Collection<?> collection)
static boolean	isEmpty(Map<?,?> map)
static boolean	isNotEmpty(Collection<?> collection)
static boolean	isNotEmpty(Map<?,?> map)
static <T> List<T>	merge(List<T> list, List<T> other) 合并 list
static <E> ArrayList<E>	newArrayList(Collection<E> collection)
static <T> List<T>	newArrayList(T... elements)
static <K,V> HashMap<K,V>	newHashMap()
static <K,V> HashMap<K,V>	newHashMap(Map<K,V> map)
static <T> Set<T>	newHashSet(T... elements)
static String[]	toArrayString(Collection<?> collection)
static <T> List<T>	toList(Collection<T> collection)

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

private CollectionUtil()

方法详细资料

isEmpty

public static boolean isEmpty(Collection<?> collection)

isNotEmpty

public static boolean isNotEmpty(Collection<?> collection)

isEmpty

public static boolean isEmpty(Map<?,?> map)

isNotEmpty

public static boolean isNotEmpty(Map<?,?> map)

merge

public static <T> List<T> merge(List<T> list,
                                List<T> other)

合并 list

newHashMap

public static <K,V> HashMap<K,V> newHashMap()

computeIfAbsent

public static <K,V> V computeIfAbsent(Map<K,V> concurrentHashMap,
                                      K key,
                                      Function<? super K,? extends V> mappingFunction)

主要是用于修复 concurrentHashMap 在 jdk1.8 下的死循环问题

另请参阅:

https://bugs.openjdk.org/browse/JDK-8161372

toList

public static <T> List<T> toList(Collection<T> collection)

toArrayString

public static String[] toArrayString(Collection<?> collection)

cloneArrayList

public static <E extends CloneSupport<E>> List<E> cloneArrayList(List<E> list)

newHashSet

public static <T> Set<T> newHashSet(T... elements)

newArrayList

public static <T> List<T> newArrayList(T... elements)

newArrayList

public static <E> ArrayList<E> newArrayList(Collection<E> collection)

newHashMap

public static <K,V> HashMap<K,V> newHashMap(Map<K,V> map)