ConcurrentReferenceHashMap.Reference (Spring Framework 5.2.12.RELEASE API)

类型参数:
K - the key type
V - the value type
封闭类:
ConcurrentReferenceHashMap<K,V>
```
protected static interface ConcurrentReferenceHashMap.Reference<K,V>
```
A reference to an ConcurrentReferenceHashMap.Entry contained in the map. Implementations are usually wrappers around specific Java reference implementations (e.g., SoftReference).

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`ConcurrentReferenceHashMap.Entry<K,V>`	`get()`	Return the referenced entry, or `null` if the entry is no longer available.
`int`	`getHash()`	Return the hash for the reference.
`ConcurrentReferenceHashMap.Reference<K,V>`	`getNext()`	Return the next reference in the chain, or `null` if none.
`void`	`release()`	Release this entry and ensure that it will be returned from `ReferenceManager#pollForPurge()`.

- 方法详细资料
  - get
```
@Nullable
ConcurrentReferenceHashMap.Entry<K,V> get()
```
    Return the referenced entry, or null if the entry is no longer available.
  - getHash
```
int getHash()
```
    Return the hash for the reference.
  - getNext
```
@Nullable
ConcurrentReferenceHashMap.Reference<K,V> getNext()
```
    Return the next reference in the chain, or null if none.
  - release
```
void release()
```
    Release this entry and ensure that it will be returned from ReferenceManager#pollForPurge().