Weak and soft references both extend the abstract reference class (as do phantom references, which will be discussed in a future article).
弱引用和软引用都扩展了抽象的reference类(虚引用(phantom references)也一样，这将在以后的文章中介绍)。
Phantomly reachable: an object that is not strongly, softly, or weakly reachable, has been finalized, and can be accessed through a phantom reference.
虚可及对象(phantomly reachable)：不是强可及对象、软可及对象，也不是弱可及对象，已经结束的，可以通过虚引用访问的对象。
Phantomly reachable: an object that is not strongly, softly, or weakly reachable, has been finalized, and can be accessed through a phantom reference.
虚可及对象(phantomly reachable)：不是强可及对象、软可及对象，也不是弱可及对象，已经结束的，可以通过虚引用访问的对象。
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