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If a field is shared between multiple threads and one of them change its value i.e. one thread reads from the field which is written by other threads, then Wholesale Jerseys Cheap , by using a volatile modifier, you can synchronize access to this field. The volatile modifier in Java provides visibility and ordering guarantee without any locking. You might know that compiler and JVM can re-order your code due to various reasons e.g. performance improvement which can be a problem in concurrent Java application.
By making a filed volatile in Java you can instruct compiler, JVM, and JIT to doesn't reorder them preventing subtle and hard-to-find multi-threading bugs.
Similarly Wholesale Jerseys Free Shipping , the visibility guarantee ensures that memory barriers are refreshed when a volatile variable is read, hence all the changes made by one thread before writing into a volatile variable is visible to the other thread who read from a volatile variable, this is also a part of "happens-before" guarantee provided by volatile variables.
Though, you need to be a little bit careful because volatile doesn't provide atomicity and mutual exclusive access Wholesale Jerseys From China , which is one of the key difference between synchronized and volatile keyword in Java. Hence, the volatile variable should only be used if the assignment is the only operation performed on them.
In this article, I am going to 10 such important points about volatile modifier in a field which will help you to learn this useful concept better in Java multi-threading world. If you want to learn more, you can always read Java concurrency in Practice by Infocampus
10 Points about volatile variable in Java
Here are a couple of useful points a Java developer should know about volatile modifier. Since many of you might not have the first-hand experience of using volatile variable in your application Wholesale Jerseys China , this points will help you to understand the existing code written by some experienced programmers and which uses the volatile modifier for synchronization and inter-thread communication.
1) The volatile modifier provides lock-free synchronization of fields. Unlike synchronized keyword, when a thread read from the volatile variable or write into the volatile field, no lock is acquired or released.
2) The volatile modifier can only be applied to a field. You cannot apply volatile keyword with methods and local variables. Of course, you don't need any synchronization for local variables because they are not shared between multiple threads. Every thread has their own copy of local variables.
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