org.dromara.hutool.core.collection.set

Class UniqueKeySet<K,V>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<V>

org.dromara.hutool.core.collection.set.UniqueKeySet<K,V>

Type Parameters:

K - 唯一键类型

V - 值对象

All Implemented Interfaces:

Serializable, Iterable<V>, Collection<V>, Set<V>

public class UniqueKeySet<K,V>
extends AbstractSet<V>
implements Serializable

唯一键的Set
通过自定义唯一键，通过uniqueGenerator生成节点对象对应的键作为Map的key，确定唯一
此Set与HashSet不同的是，HashSet依赖于Object.equals(Object)确定唯一
但是很多时候我们无法对对象进行修改，此时在外部定义一个唯一规则，即可完成去重。

  Set<UniqueTestBean> set = new UniqueKeySet<>(UniqueTestBean::getId);
 

Since:

5.7.23

Author:

looly

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
UniqueKeySet(boolean isLinked, Function<V,K> uniqueGenerator) 构造
UniqueKeySet(boolean isLinked, Function<V,K> uniqueGenerator, Collection<? extends V> c) 构造
UniqueKeySet(Function<V,K> uniqueGenerator) 构造
UniqueKeySet(Function<V,K> uniqueGenerator, Collection<? extends V> c) 构造
UniqueKeySet(int initialCapacity, float loadFactor, Function<V,K> uniqueGenerator) 构造
UniqueKeySet(MapBuilder<K,V> builder, Function<V,K> uniqueGenerator) 构造

Method Summary

Modifier and Type	Method and Description
boolean	add(V v)
boolean	addAllIfAbsent(Collection<? extends V> c) 加入集合中所有的值，如果值已经存在，则忽略之
boolean	addIfAbsent(V v) 加入值，如果值已经存在，则忽略之
void	clear()
UniqueKeySet<K,V>	clone()
boolean	contains(Object o)
boolean	isEmpty()
Iterator<V>	iterator()
boolean	remove(Object o)
int	size()

Methods inherited from class java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection

addAll, containsAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Set

addAll, containsAll, retainAll, spliterator, toArray, toArray

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Constructor Detail

UniqueKeySet

public UniqueKeySet(Function<V,K> uniqueGenerator)

构造

Parameters:

uniqueGenerator - 唯一键生成规则函数，用于生成对象对应的唯一键

UniqueKeySet

public UniqueKeySet(Function<V,K> uniqueGenerator,
                    Collection<? extends V> c)

构造

Parameters:

uniqueGenerator - 唯一键生成规则函数，用于生成对象对应的唯一键

c - 初始化加入的集合

Since:

5.8.0

UniqueKeySet

public UniqueKeySet(boolean isLinked,
                    Function<V,K> uniqueGenerator)

构造

Parameters:

isLinked - 是否保持加入顺序

uniqueGenerator - 唯一键生成规则函数，用于生成对象对应的唯一键

UniqueKeySet

public UniqueKeySet(boolean isLinked,
                    Function<V,K> uniqueGenerator,
                    Collection<? extends V> c)

构造

Parameters:

isLinked - 是否保持加入顺序

uniqueGenerator - 唯一键生成规则函数，用于生成对象对应的唯一键

c - 初始化加入的集合

Since:

5.8.0

UniqueKeySet

public UniqueKeySet(int initialCapacity,
                    float loadFactor,
                    Function<V,K> uniqueGenerator)

构造

Parameters:

initialCapacity - 初始容量

loadFactor - 增长因子

uniqueGenerator - 唯一键生成规则函数，用于生成对象对应的唯一键

UniqueKeySet

public UniqueKeySet(MapBuilder<K,V> builder,
                    Function<V,K> uniqueGenerator)

构造

Parameters:

builder - 初始Map，定义了Map类型

uniqueGenerator - 唯一键生成规则函数，用于生成对象对应的唯一键

Method Detail

iterator

public Iterator<V> iterator()

Specified by:

iterator in interface Iterable<V>

Specified by:

iterator in interface Collection<V>

Specified by:

iterator in interface Set<V>

Specified by:

iterator in class AbstractCollection<V>

size

public int size()

Specified by:

size in interface Collection<V>

Specified by:

size in interface Set<V>

Specified by:

size in class AbstractCollection<V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Collection<V>

Specified by:

isEmpty in interface Set<V>

Overrides:

isEmpty in class AbstractCollection<V>

contains

public boolean contains(Object o)

Specified by:

contains in interface Collection<V>

Specified by:

contains in interface Set<V>

Overrides:

contains in class AbstractCollection<V>

add

public boolean add(V v)

Specified by:

add in interface Collection<V>

Specified by:

add in interface Set<V>

Overrides:

add in class AbstractCollection<V>

addIfAbsent

public boolean addIfAbsent(V v)

加入值，如果值已经存在，则忽略之

Parameters:

v - 值

Returns:

是否成功加入

addAllIfAbsent

public boolean addAllIfAbsent(Collection<? extends V> c)

加入集合中所有的值，如果值已经存在，则忽略之

Parameters:

c - 集合

Returns:

是否有一个或多个被加入成功

remove

public boolean remove(Object o)

Specified by:

remove in interface Collection<V>

Specified by:

remove in interface Set<V>

Overrides:

remove in class AbstractCollection<V>

clear

public void clear()

Specified by:

clear in interface Collection<V>

Specified by:

clear in interface Set<V>

Overrides:

clear in class AbstractCollection<V>

clone

public UniqueKeySet<K,V> clone()

Overrides:

clone in class Object