java.util.concurrent.atomic (Java Platform SE 8 ) - Oracle
https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/package-summary.html
WebA small toolkit of classes that support lock-free thread-safe programming on single variables. In essence, the classes in this package extend the notion of volatile values, fields, and array elements to those that also provide an atomic conditional update operation of the form: boolean compareAndSet(expectedValue, updateValue);
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