The get method returns the reference to the referent object.

get方法返回对被引用对象的引用。

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All Reference types are cleared before they are enqueued, so the thread handling the post-mortem cleanup never has access to the referent object, only the Reference object.

所有Reference类型在加入队列之前被清除，所以处理事后检查(post - mortem)清除的线程永远不会具有referent对象的访问权，而只具有Reference对象的访问权。

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A weak reference is a holder for a reference to an object, called the referent.

弱引用是对一个对象(称为referent)的引用的持有者。

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