com.fr.stable.collections.map

类 IntSet

java.lang.Object

com.fr.stable.collections.map.IntSet

public class IntSet
extends java.lang.Object

An unordered set that uses int keys. This implementation uses cuckoo hashing using 3 hashes, random walking, and a small stash for problematic keys. No allocation is done except when growing the table size.

This set performs very fast contains and remove (typically O(1), worst case O(log(n))). Add may be a bit slower, depending on hash collisions. Load factors greater than 0.91 greatly increase the chances the set will have to rehash to the next higher POT size.

作者:

Nathan Sweet

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	IntSet.IntSetIterator

字段概要

字段

限定符和类型	字段和说明
int	size

构造器概要

构造器

构造器和说明
IntSet() Creates a new set with an initial capacity of 51 and a load factor of 0.8.
IntSet(int initialCapacity) Creates a new set with a load factor of 0.8.
IntSet(int initialCapacity, float loadFactor) Creates a new set with the specified initial capacity and load factor.
IntSet(IntSet set) Creates a new set identical to the specified set.

方法概要

方法

限定符和类型	方法和说明
boolean	add(int key) Returns true if the key was not already in the set.
void	addAll(int... array)
void	addAll(int[] array, int offset, int length)
void	addAll(IntArray array)
void	addAll(IntArray array, int offset, int length)
void	addAll(IntSet set)
void	clear()
void	clear(int maximumCapacity) Clears the set and reduces the size of the backing arrays to be the specified capacity if they are larger.
boolean	contains(int key)
void	ensureCapacity(int additionalCapacity) Increases the size of the backing array to accommodate the specified number of additional items.
boolean	equals(java.lang.Object obj)
int	first()
int	hashCode()
IntSet.IntSetIterator	iterator() Returns an iterator for the keys in the set.
boolean	remove(int key) Returns true if the key was removed.
void	shrink(int maximumCapacity) Reduces the size of the backing arrays to be the specified capacity or less.
java.lang.String	toString()
static IntSet	with(int... array)

从类继承的方法 java.lang.Object

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

字段详细资料

size

public int size

构造器详细资料

IntSet

public IntSet()

Creates a new set with an initial capacity of 51 and a load factor of 0.8.

IntSet

public IntSet(int initialCapacity)

Creates a new set with a load factor of 0.8.

参数:

initialCapacity - If not a power of two, it is increased to the next nearest power of two.

IntSet

public IntSet(int initialCapacity,
      float loadFactor)

Creates a new set with the specified initial capacity and load factor. This set will hold initialCapacity items before growing the backing table.

参数:

initialCapacity - If not a power of two, it is increased to the next nearest power of two.

IntSet

public IntSet(IntSet set)

Creates a new set identical to the specified set.

方法详细资料

add

public boolean add(int key)

Returns true if the key was not already in the set.

addAll

public void addAll(IntArray array)

addAll

public void addAll(IntArray array,
          int offset,
          int length)

addAll

public void addAll(int... array)

addAll

public void addAll(int[] array,
          int offset,
          int length)

addAll

public void addAll(IntSet set)

remove

public boolean remove(int key)

Returns true if the key was removed.

shrink

public void shrink(int maximumCapacity)

Reduces the size of the backing arrays to be the specified capacity or less. If the capacity is already less, nothing is done. If the set contains more items than the specified capacity, the next highest power of two capacity is used instead.

clear

public void clear(int maximumCapacity)

Clears the set and reduces the size of the backing arrays to be the specified capacity if they are larger.

clear

public void clear()

contains

public boolean contains(int key)

first

public int first()

ensureCapacity

public void ensureCapacity(int additionalCapacity)

Increases the size of the backing array to accommodate the specified number of additional items. Useful before adding many items to avoid multiple backing array resizes.

hashCode

public int hashCode()

覆盖:

hashCode 在类中 java.lang.Object

equals

public boolean equals(java.lang.Object obj)

覆盖:

equals 在类中 java.lang.Object

toString

public java.lang.String toString()

覆盖:

toString 在类中 java.lang.Object

iterator

public IntSet.IntSetIterator iterator()

Returns an iterator for the keys in the set. Remove is supported. Note that the same iterator instance is returned each time this method is called. Use the IntSet.IntSetIterator constructor for nested or multithreaded iteration.

with

public static IntSet with(int... array)