是否有任何钩子可以避免在Java中用垃圾回收注册线程？

Question

JVM provides you a hook to register a thread with the shutdown initiation sequence. Once a thread is registered, on every shutdown that thread is run.

Now, is there any such a hook java provide to register a thread with JVM's Garbage collector?

Answer 1

You do have finalizers , but they're not guaranteed to run.

Further discussion about why finalizers may not run in this thread: When is the finalize() method called in Java?

Answer 2

不完全是一个钩子，但是您可以使用WeakReference来通知对象已经可以进行垃圾收集了。

Answer 3

There are WeakReferences as already mentioned but there are also Phantom References

All of these techniques just allow you to monitor garbage collection on specific objects though.

There is a good description of phantom references here: http://java.dzone.com/articles/finalization-and-phantom