ObjectMap

java.lang.Object
- com.fr.stable.collections.map.ObjectMap<K,V>

所有已实现的接口:

java.lang.Iterable<ObjectMap.Entry<K,V>>

直接已知子类:

OrderedMap
```
public class ObjectMap<K,V>
extends java.lang.Object
implements java.lang.Iterable<ObjectMap.Entry<K,V>>
```
An unordered map. This implementation is a cuckoo hash map using 3 hashes, random walking, and a small stash for problematic keys. Null keys are not allowed. Null values are allowed. No allocation is done except when growing the table size.

This map performs very fast get, containsKey, and remove (typically O(1), worst case O(log(n))). Put may be a bit slower, depending on hash collisions. Load factors greater than 0.91 greatly increase the chances the map 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`	`ObjectMap.Entries<K,V>`
`static class`	`ObjectMap.Entry<K,V>`
`static class`	`ObjectMap.Keys<K>`
`static class`	`ObjectMap.Values<V>`

字段概要

字段
限定符和类型字段和说明

int size

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
`ObjectMap()` Creates a new map with an initial capacity of 51 and a load factor of 0.8.
`ObjectMap(int initialCapacity)` Creates a new map with a load factor of 0.8.
`ObjectMap(int initialCapacity, float loadFactor)` Creates a new map with the specified initial capacity and load factor.
`ObjectMap(ObjectMap<? extends K,? extends V> map)` Creates a new map identical to the specified map.

方法概要

方法
限定符和类型	方法和说明
`void`	`clear()`
`void`	`clear(int maximumCapacity)` Clears the map and reduces the size of the backing arrays to be the specified capacity if they are larger.
`boolean`	`containsKey(K key)`
`boolean`	`containsValue(java.lang.Object value, boolean identity)` Returns true if the specified value is in the map.
`void`	`ensureCapacity(int additionalCapacity)` Increases the size of the backing array to accommodate the specified number of additional items.
`ObjectMap.Entries<K,V>`	`entries()` Returns an iterator for the entries in the map.
`boolean`	`equals(java.lang.Object obj)`
`K`	`findKey(java.lang.Object value, boolean identity)` Returns the key for the specified value, or null if it is not in the map.
`V`	`get(K key)`
`V`	`get(K key, V defaultValue)` Returns the value for the specified key, or the default value if the key is not in the map.
`int`	`hashCode()`
`ObjectMap.Entries<K,V>`	`iterator()`
`ObjectMap.Keys<K>`	`keys()` Returns an iterator for the keys in the map.
`V`	`put(K key, V value)` Returns the old value associated with the specified key, or null.
`void`	`putAll(ObjectMap<K,V> map)`
`V`	`remove(K key)`
`void`	`shrink(int maximumCapacity)` Reduces the size of the backing arrays to be the specified capacity or less.
`java.lang.String`	`toString()`
`java.lang.String`	`toString(java.lang.String separator)`
`ObjectMap.Values<V>`	`values()` Returns an iterator for the values in the map.

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
  - ObjectMap
```
public ObjectMap()
```
    Creates a new map with an initial capacity of 51 and a load factor of 0.8.
  - ObjectMap
```
public ObjectMap(int initialCapacity)
```
    Creates a new map 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.
  - ObjectMap
```
public ObjectMap(int initialCapacity,
         float loadFactor)
```
    Creates a new map with the specified initial capacity and load factor. This map 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.
  - ObjectMap
```
public ObjectMap(ObjectMap<? extends K,? extends V> map)
```
    Creates a new map identical to the specified map.
- 方法详细资料
  - put
```
public V put(K key,
    V value)
```
    Returns the old value associated with the specified key, or null.
  - putAll
```
public void putAll(ObjectMap<K,V> map)
```
  - get
```
public V get(K key)
```
  - get
```
public V get(K key,
    V defaultValue)
```
    Returns the value for the specified key, or the default value if the key is not in the map.
  - remove
```
public V remove(K key)
```
  - 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 map 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 map and reduces the size of the backing arrays to be the specified capacity if they are larger.
  - clear
```
public void clear()
```
  - containsValue
```
public boolean containsValue(java.lang.Object value,
                    boolean identity)
```
    Returns true if the specified value is in the map. Note this traverses the entire map and compares every value, which may be an expensive operation.
    
    参数:
    identity - If true, uses == to compare the specified value with values in the map. If false, uses equals(Object).
  - containsKey
```
public boolean containsKey(K key)
```
  - findKey
```
public K findKey(java.lang.Object value,
        boolean identity)
```
    Returns the key for the specified value, or null if it is not in the map. Note this traverses the entire map and compares every value, which may be an expensive operation.
    
    参数:
    identity - If true, uses == to compare the specified value with values in the map. If false, uses equals(Object).
  - 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(java.lang.String separator)
```
  - toString
```
public java.lang.String toString()
```
    覆盖:
    
    toString 在类中 java.lang.Object
  - iterator
```
public ObjectMap.Entries<K,V> iterator()
```
    指定者:
    
    iterator 在接口中 java.lang.Iterable<ObjectMap.Entry<K,V>>
  - entries
```
public ObjectMap.Entries<K,V> entries()
```
    Returns an iterator for the entries in the map. Remove is supported. Note that the same iterator instance is returned each time this method is called. Use the ObjectMap.Entries constructor for nested or multithreaded iteration.
  - values
```
public ObjectMap.Values<V> values()
```
    Returns an iterator for the values in the map. Remove is supported. Note that the same iterator instance is returned each time this method is called. Use the ObjectMap.Values constructor for nested or multithreaded iteration.
  - keys
```
public ObjectMap.Keys<K> keys()
```
    Returns an iterator for the keys in the map. Remove is supported. Note that the same iterator instance is returned each time this method is called. Use the ObjectMap.Keys constructor for nested or multithreaded iteration.

类 ObjectMap<K,V>

嵌套类概要

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

size

构造器详细资料

ObjectMap

ObjectMap

ObjectMap

ObjectMap

方法详细资料

put

putAll

get

get

remove

shrink

clear

clear

containsValue

containsKey

findKey

ensureCapacity

hashCode

equals

toString

toString

iterator

entries

values

keys