Given the above code, writes that initialize the Foo instance could be delayed until the write of the instance value, thus creating the possibility that the instance returns an object in an uninitialized state.
In order to avoid this, the instance value must be made volatile.
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/4715/viewspace-3143110/ ，如需转载，请注明出处，否则将追究法律责任。
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