Question: What Is Volatile In Java?

What is volatile and non volatile in Java?

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 volatile and transient in Java?

The volatile keyword flushes the changes directly to the main memory instead of the CPU cache. On the other hand, the transient keyword is used during serialization. Fields that are marked as transient can not be part of the serialization and deserialization.

What is volatile keyword?

The volatile keyword prevents the compiler from performing optimization on code involving volatile objects, thus ensuring that each volatile variable assignment and read has a corresponding memory access.

What is difference between static and volatile in Java?

static simply means not associated with an instance of the containing class. volatile simply means that the value may be changed by other threads without warning.

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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. Thread A now writes the reference to the newly created singleton into uniqueInstance, and gets ready to release its lock.

When should Volatile be used?

A variable should be declared volatile whenever its value could change unexpectedly. In practice, only three types of variables could change: Memory-mapped peripheral registers. Global variables modified by an interrupt service routine.

Why transient is used in Java?

The transient keyword in Java is used to avoid serialization. If any object of a data structure is defined as a transient, then it will not be serialized. Serialization is the ​process of converting an object into a byte stream.

What is purpose of serialization of an object?

Serialization is the process of converting an object into a stream of bytes to store the object or transmit it to memory, a database, or a file. Its main purpose is to save the state of an object in order to be able to recreate it when needed.

What is difference between transient and static in serialization?

Transient variable will be ignored during serialization. Static variable will be serialized if the value is initialized during declaration itself. If a variable contains both transient and static keyword, also if the value is initialized during declaration, then it will be serialized.

What is the difference between static and volatile variable?

In the above example, static variables are class members that are shared among all objects. There is only one copy in the main memory. The value of a volatile variable will never be stored in the cache. All read and write will be done from and to the main memory.

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What is volatile data?

Volatile data is any data that is stored temporarily on a computer device while it is running and would be lost if the device shuts down for any reason. It exists in temporary cache files, RAM and system files.

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.

What does synchronized mean in Java?

1. Synchronized keyword in Java is used to provide mutually exclusive access to a shared resource with multiple threads in Java. Synchronization in Java guarantees that no two threads can execute a synchronized method which requires the same lock simultaneously or concurrently.

Can we use static variable in multithreading?

static makes no sense in Multi-Threading.

Can we use static and volatile together in C?

Yes. A variable can be declared as bothvolatile and constant in C. Constmodifier does not allow changing the value of the variable byinternal program. But, it does not mean that value of constvariable should not be changed by external code.

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