java volatile
时间: 2023-10-22 22:35:06 浏览: 55
Java volatile is a keyword that is used to indicate that a variable's value may be modified by different threads. In other words, when a variable is declared as volatile, it means that any changes made to it by one thread are immediately visible to all other threads.
The use of volatile keyword is important in multi-threaded programming as it ensures the consistency of shared data between threads. Without the use of volatile, there may be instances where one thread reads a stale value of a variable that has already been modified by another thread.
When a variable is declared as volatile, the Java Virtual Machine (JVM) ensures that the variable is stored in main memory instead of being stored in the thread's local cache. This ensures that all threads have access to the same copy of the variable.
It is important to note that the use of volatile does not guarantee thread safety. It only guarantees the visibility of the variable's value across threads. To ensure thread safety, synchronization or other mechanisms should be employed.
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