blade.kit

类 CollectionKit

java.lang.Object

blade.kit.CollectionKit

public abstract class CollectionKit
extends Object

集合处理类

从以下版本开始:

1.0

作者:

biezhi

构造器概要

构造器

构造器和说明
CollectionKit()

方法概要

限定符和类型	方法和说明
static <T> T[]	concat(T[] a, T[] b) merge array
static boolean	isEmpty(Collection<?> collection) Return true if the supplied Collection is null or empty.
static <K,V> boolean	isEmpty(Map<K,V> map) return map is empty
static <T> boolean	isEmpty(T[] arr) return array is empty
static <T> ArrayList<T>	newArrayList() new ArrayList
static <T> ArrayList<T>	newArrayList(int size) new ArrayList and initialCapacity
static <K,V> ConcurrentHashMap<K,V>	newConcurrentHashMap() new concurrentHashMap
static <K,V> ConcurrentHashMap<K,V>	newConcurrentHashMap(int size) new concurrentHashMap and initialCapacity
static <K,V> HashMap<K,V>	newHashMap() new HashMap
static <K,V> HashMap<K,V>	newHashMap(int size) new HashMap and initialCapacity
static <T> HashSet<T>	newHashSet() new HashSet
static <T> HashSet<T>	newHashSet(int size) new HashSet and initialCapacity
static <T> TreeSet<T>	newTreeSet() new TreeSet
static <K,V> Map<K,V>	sortMap(Map<K,V> map, Comparator<Map.Entry<K,V>> compator) map sort

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

CollectionKit

public CollectionKit()

方法详细资料

newHashMap

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

new HashMap

newHashMap

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

new HashMap and initialCapacity

newConcurrentHashMap

public static <K,V> ConcurrentHashMap<K,V> newConcurrentHashMap()

new concurrentHashMap

newConcurrentHashMap

public static <K,V> ConcurrentHashMap<K,V> newConcurrentHashMap(int size)

new concurrentHashMap and initialCapacity

newArrayList

public static <T> ArrayList<T> newArrayList()

new ArrayList

newArrayList

public static <T> ArrayList<T> newArrayList(int size)

new ArrayList and initialCapacity

newHashSet

public static <T> HashSet<T> newHashSet()

new HashSet

newHashSet

public static <T> HashSet<T> newHashSet(int size)

new HashSet and initialCapacity

newTreeSet

public static <T> TreeSet<T> newTreeSet()

new TreeSet

sortMap

public static <K,V> Map<K,V> sortMap(Map<K,V> map,
                                     Comparator<Map.Entry<K,V>> compator)

map sort

isEmpty

public static <K,V> boolean isEmpty(Map<K,V> map)

return map is empty

isEmpty

public static <T> boolean isEmpty(T[] arr)

return array is empty

concat

public static <T> T[] concat(T[] a,
                             T[] b)

merge array

参数:

a -

b -

返回:

isEmpty

public static boolean isEmpty(Collection<?> collection)

Return true if the supplied Collection is null or empty. Otherwise, return false.

参数:

collection - the Collection to check

返回:

whether the given Collection is empty