Each of the reference classes has a get method, and the ReferenceQueue class has a poll method.

每个引用类都有一个get方法，而Reference Queue类有一个poll方法。

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This means that the garbage collector freed the memory for MyObject, enabling the WeakReference object to be placed on its ReferenceQueue.

这意味着垃圾收集器释放了MyObject占用的内存，从而使WeakReference对象可以被放在它的Reference Queue上。

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When the heap object's finalize method is run and its memory freed, the SoftReference object is added to its ReferenceQueue, if it exists.

当heap对象的finalize方法被运行而且该对象占用的内存被释放，S of tReference对象就被添加到它的Reference Queue(如果后者存在的话)。

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