com.alipay.sofa.rpc.common.struct

类 ConcurrentHashSet<E>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<E>

com.alipay.sofa.rpc.common.struct.ConcurrentHashSet<E>

所有已实现的接口:

Serializable, Iterable<E>, Collection<E>, Set<E>

public class ConcurrentHashSet<E>
extends AbstractSet<E>
implements Set<E>, Serializable

线程安全的hashset

另请参阅:

ConcurrentHashMap, 序列化表格

构造器概要

构造器

构造器和说明
ConcurrentHashSet()
ConcurrentHashSet(Collection<? extends E> c)
ConcurrentHashSet(int initialCapacity)

方法概要

方法

限定符和类型	方法和说明
boolean	add(E e) Adds the specified element to this set if it is not already present.
void	clear() Removes all of the elements from this set.
boolean	contains(Object o) Returns true if this set contains the specified element.
boolean	isEmpty() Returns true if this set contains no elements.
Iterator<E>	iterator() Returns an iterator over the elements in this set.
boolean	remove(Object o) Removes the specified element from this set if it is present.
int	size() Returns the number of elements in this set (its cardinality).

从类继承的方法 java.util.AbstractSet

equals, hashCode, removeAll

从类继承的方法 java.util.AbstractCollection

addAll, containsAll, retainAll, toArray, toArray, toString

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

从接口继承的方法 java.util.Set

addAll, containsAll, equals, hashCode, removeAll, retainAll, toArray, toArray

构造器详细资料

ConcurrentHashSet

public ConcurrentHashSet()

ConcurrentHashSet

public ConcurrentHashSet(int initialCapacity)

ConcurrentHashSet

public ConcurrentHashSet(Collection<? extends E> c)

方法详细资料

iterator

public Iterator<E> iterator()

Returns an iterator over the elements in this set. The elements are returned in no particular order.

指定者:

iterator 在接口中 Iterable<E>

指定者:

iterator 在接口中 Collection<E>

指定者:

iterator 在接口中 Set<E>

指定者:

iterator 在类中 AbstractCollection<E>

返回:

an Iterator over the elements in this set

另请参阅:

ConcurrentModificationException

size

public int size()

Returns the number of elements in this set (its cardinality).

指定者:

size 在接口中 Collection<E>

指定者:

size 在接口中 Set<E>

指定者:

size 在类中 AbstractCollection<E>

返回:

the number of elements in this set (its cardinality)

isEmpty

public boolean isEmpty()

Returns true if this set contains no elements.

指定者:

isEmpty 在接口中 Collection<E>

指定者:

isEmpty 在接口中 Set<E>

覆盖:

isEmpty 在类中 AbstractCollection<E>

返回:

true if this set contains no elements

contains

public boolean contains(Object o)

Returns true if this set contains the specified element. More formally, returns true if and only if this set contains an element e such that (o==null ? e==null : o.equals(e)).

指定者:

contains 在接口中 Collection<E>

指定者:

contains 在接口中 Set<E>

覆盖:

contains 在类中 AbstractCollection<E>

参数:

o - element whose presence in this set is to be tested

返回:

true if this set contains the specified element

add

public boolean add(E e)

Adds the specified element to this set if it is not already present. More formally, adds the specified element e to this set if this set contains no element e2 such that (e==null ? e2==null : e.equals(e2)). If this set already contains the element, the call leaves the set unchanged and returns false.

指定者:

add 在接口中 Collection<E>

指定者:

add 在接口中 Set<E>

覆盖:

add 在类中 AbstractCollection<E>

参数:

e - element to be added to this set

返回:

true if this set did not already contain the specified element

remove

public boolean remove(Object o)

Removes the specified element from this set if it is present. More formally, removes an element e such that (o==null ? e==null : o.equals(e)), if this set contains such an element. Returns true if this set contained the element (or equivalently, if this set changed as a result of the call). (This set will not contain the element once the call returns.)

指定者:

remove 在接口中 Collection<E>

指定者:

remove 在接口中 Set<E>

覆盖:

remove 在类中 AbstractCollection<E>

参数:

o - object to be removed from this set, if present

返回:

true if the set contained the specified element

clear

public void clear()

Removes all of the elements from this set. The set will be empty after this call returns.

指定者:

clear 在接口中 Collection<E>

指定者:

clear 在接口中 Set<E>

覆盖:

clear 在类中 AbstractCollection<E>