[java] Volatile vs Static in Java

Difference Between Static and Volatile :

Static Variable: If two Threads(suppose t1 and t2) are accessing the same object and updating a variable which is declared as static then it means t1 and t2 can make their own local copy of the same object(including static variables) in their respective cache, so update made by t1 to the static variable in its local cache wont reflect in the static variable for t2 cache .

Static variables are used in the context of Object where update made by one object would reflect in all the other objects of the same class but not in the context of Thread where update of one thread to the static variable will reflect the changes immediately to all the threads (in their local cache).

Volatile variable: If two Threads(suppose t1 and t2) are accessing the same object and updating a variable which is declared as volatile then it means t1 and t2 can make their own local cache of the Object except the variable which is declared as a volatile . So the volatile variable will have only one main copy which will be updated by different threads and update made by one thread to the volatile variable will immediately reflect to the other Thread.

Examples related to java

Under what circumstances can I call findViewById with an Options Menu / Action Bar item? How much should a function trust another function How to implement a simple scenario the OO way Two constructors How do I get some variable from another class in Java? this in equals method How to split a string in two and store it in a field How to do perspective fixing? String index out of range: 4 My eclipse won't open, i download the bundle pack it keeps saying error log

Examples related to multithreading

How can compare-and-swap be used for a wait-free mutual exclusion for any shared data structure? Waiting until the task finishes What is the difference between Task.Run() and Task.Factory.StartNew() Why is setState in reactjs Async instead of Sync? What exactly is std::atomic? Calling async method on button click WAITING at sun.misc.Unsafe.park(Native Method) How to use background thread in swift? What is the use of static synchronized method in java? Locking pattern for proper use of .NET MemoryCache

Examples related to concurrency

WAITING at sun.misc.Unsafe.park(Native Method) What is the Swift equivalent to Objective-C's "@synchronized"? Custom thread pool in Java 8 parallel stream How to check if another instance of my shell script is running How to use the CancellationToken property? What's the difference between a Future and a Promise? Why use a ReentrantLock if one can use synchronized(this)? NSOperation vs Grand Central Dispatch What's the difference between Thread start() and Runnable run() multiprocessing.Pool: When to use apply, apply_async or map?

Examples related to static

What is the equivalent of Java static methods in Kotlin? Creating a static class with no instances Static vs class functions/variables in Swift classes? Call static methods from regular ES6 class methods What is the difference between static func and class func in Swift? An object reference is required to access a non-static member Mocking static methods with Mockito @Autowired and static method The static keyword and its various uses in C++ Non-Static method cannot be referenced from a static context with methods and variables

Examples related to volatile

Volatile Vs Atomic What is the difference between atomic / volatile / synchronized? Why do we use volatile keyword? Volatile boolean vs AtomicBoolean Difference between volatile and synchronized in Java Volatile vs Static in Java Why is volatile needed in C? Volatile vs. Interlocked vs. lock What is the volatile keyword useful for?