What is volatile keyword in Java?

What is volatile keyword in Java?

The Java volatile keyword is intended to address variable visibility problems. By declaring the counter variable volatile all writes to the counter variable will be written back to main memory immediately. Declaring a variable volatile thus guarantees the visibility for other threads of writes to that variable.

Where we can use volatile keyword in Java?

Volatile keyword is used to modify the value of a variable by different threads. It is also used to make classes thread safe. It means that multiple threads can use a method and instance of the classes at the same time without any problem. The volatile keyword can be used either with primitive type or objects.

How is volatile implemented in Java?

1. The volatile keyword in Java is only application to a variable and using a volatile keyword with class and method is illegal. 2. volatile keyword in Java guarantees that the value of the volatile variable will always be read from main memory and not from Thread’s local cache.

What is the volatile keyword used for?

The volatile keyword is intended to prevent the compiler from applying any optimizations on objects that can change in ways that cannot be determined by the compiler. Objects declared as volatile are omitted from optimization because their values can be changed by code outside the scope of current code at any time.

Why is volatile needed?

The volatile field is needed to make sure that multiple threads always see the newest value, even when the cache system or compiler optimizations are at work. Reading from a volatile variable always returns the latest written value from this variable.

What is the meaning of static variable?

In programming, a static variable is the one allocated “statically,” which means its lifetime is throughout the program run. It is declared with the ‘static’ keyword and persists its value across the function calls.

Can we use static variable in multithreading?

static makes no sense in Multi-Threading.

Can you change a static variable Java?

It is a static variable so you won’t need any object of class in order to access it. It’s final so the value of this variable can never be changed in the current or in any class.

What are static variables and methods of a class?

Static variables belong to the class, with all objects of a class sharing a single static variable. Static methods are associated with the class, not objects of the class. Static variables are used with the class name and the dot operator, since they are associated with a class, not objects of a class.

Can we inherit a final method in Java?

No, we cannot override a final method in Java. The final modifier for finalizing the implementations of classes, methods, and variables. We can declare a method as final, once you declare a method final it cannot be overridden.

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