Shulou(Shulou.com)06/02 Report--

This article is to share with you about the difference between volatile and synchronized, the editor thinks it is very practical, so I share it with you to learn. I hope you can get something after reading this article.

The volatile keyword ensures the visibility of variables between threads, and contains semantics that prohibit instruction reordering, which satisfies ordering.

The synchronized keyword atomicity (exclusive lock), visibility, and ordering can be satisfied. So the difference between them is atomicity.

PS:

The above characteristics can be explained by the principle of prior occurrence of happens-before. The first occurrence is the partial order relationship between the two operations defined in the Java memory model. Third, the volatile variable rule: the write operation to a volatile variable first occurs in the read operation, satisfying the visibility. Second, the principle of pipe locking: a unlock occurs first in the lock of the same lock, satisfying the orderliness.

These are the differences between volatile and synchronized. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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