| Class | Description | 
|---|---|
| ReferenceConcurrentMap<K,V> | 
 线程安全的ReferenceMap实现 
 | 
| SoftConcurrentMap<K,V> | 
 线程安全的SoftMap实现 
键和值都为Soft引用,即,在GC报告内存不足时会被GC回收  | 
| WeakKeyConcurrentMap<K,V> | 
 线程安全的WeakMap实现 
键为Weak引用,即,在GC时发现弱引用会回收其对象  | 
| WeakKeyValueConcurrentMap<K,V> | 
 线程安全的WeakMap实现 
键和值都为Weak引用,即,在GC时发现弱引用会回收其对象  | 
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