Best answer: How do you declare a volatile variable in Java?

How do you create a variable volatile in Java?

You can use the volatile keyword with variables. Using volatile keyword with classes and methods is illegal. It guarantees that value of the volatile variable will always be read from the main memory, not from the local thread cache. It reduces the risk of memory consistency error.

How do you declare a volatile variable?

volatile is a keyword that must be used when declaring any variable that will reference a device register. If this is not done, the compile-time optimizer might optimize important accesses away.

How is volatile implemented in Java?

A 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.

What is the difference between static and volatile variable?

1. static variable is used for global variable which has used for update the value without changing stored into global part of memory. 2. volatile is used when the value of variable is updated by external factor (e.g. interrupts in micro-controller) and compiler is not optimized the volatile variable.

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Why volatile is used in Singleton?

The volatile prevents memory writes from being re-ordered, making it impossible for other threads to read uninitialized fields of your singleton through the singleton’s pointer.

Can we use const and volatile together?

Yes. A variable can be declared as both volatile and constant in C. Const modifier does not allow changing the value of the variable by internal program. … So, a variable can be both volatile and constant in C.

What is an example of non-volatile memory?

Examples of non-volatile memory include read-only memory (see ROM), flash memory, most types of magnetic computer storage devices (e.g. hard disks, floppy discs and magnetic tape), optical discs, and early computer storage methods such as paper tape and punched cards.

What is volatile variable in C++?

volatile means two things − – The value of the variable may change without any code of yours changing it. Therefore whenever the compiler reads the value of the variable, it may not assume that it is the same as the last time it was read, or that it is the same as the last value stored, but it must be read again.

What is difference between static and volatile in Java?

volatile variable value access will be direct from main memory. It should be used only in multi-threading environment. static variable will be loaded one time. If its used in single thread environment, even if the copy of the variable will be updated and there will be no harm accessing it as there is only one thread.

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Is package a keyword in Java?

Java package is a group of similar classes and interfaces. Packages are declared with the package keyword. The private keyword is used in the declaration of a method, field, or inner class; private members can only be accessed by other members of their own class.

Can we override static method?

Can we Override static methods in java? We can declare static methods with the same signature in the subclass, but it is not considered overriding as there won’t be any run-time polymorphism.

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