From the course: Parallel and Concurrent Programming with Java 1
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Atomic variable: Java demo - Java Tutorial
From the course: Parallel and Concurrent Programming with Java 1
Atomic variable: Java demo
- [Instructor] Using a lock to protect a shared variable with mutual exclusion works, but if you're only doing simple operations like incrementing the variables value, then a simpler way to do that in Java is by using the Atomic package. It provides a collection of classes that support lock-free, thread safe programming on single variables. If I scroll down on the documentation page, I see a variety of classes I can choose from including Atomic booleans, integers, arrays, long values, references, and so on. I'll select the Atomic integer class, and if I scroll down, I can see that it has a variety of methods that implement Atomic versions of most standard integer operations. To demonstrate using Atomic variables in Java, I'm going to modify the previous example code that I used to demonstrate a data race. It has two parallel threads incrementing a count variable 10 millions times each. I should get an output of 20 million, but since I'm just using a regular integer on line seven, and…
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