Softly reachable: an object that is not strongly reachable and can be accessed through a soft reference.
软可及对象(softly reachable)：不是强可及对象，并且能够通过软引用访问的对象。
The key point is that when the garbage collector runs, it may or may not free an object that is softly reachable.
关键之处在于，垃圾收集器在运行时可能会（也可能不会）释放软可及对象。
Weakly reachable: an object that is not strongly or softly reachable and can be accessed through a weak reference.
弱可及对象(weakly reachable)：不是强可及对象也不是软可及对象，并且能够通过弱引用访问的对象。
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