Table of Contents
How does volatile work internally?
Since volatile keyword in Java only synchronizes the value of one variable between Thread memory and “ main ” memory while synchronized synchronizes the value of all variable between thread memory and “ main ” memory and locks and releases a monitor to boot.
Does volatile prevent race conditions?
Making a variable volatile does not protect it from race conditions, it just indicates that the object to which the variable is bound may mutate to prevent compiler optimizations, it is not needed in your case because I & j are modified in the same thread (the loop thread).
What is the difference between volatile and transient?
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.
When should I use volatile?
Yes, volatile must be used whenever you want a mutable variable to be accessed by multiple threads. It is not very common usecase because typically you need to perform more than a single atomic operation (e.g. check the variable state before modifying it), in which case you would use a synchronized block instead.
Why do we use volatile?
volatile plays an important role in C programming as the compiler can’t guess about the value. The main reason behind using volatile is that it can change value any time a user wants it to be changed or when another thread is running but using the same variable.
Can you again start thread?
No. After starting a thread, it can never be started again. If you does so, an IllegalThreadStateException is thrown. In such case, thread will run once but for second time, it will throw exception.
Does volatile make thread-safe?
Therefore, the volatile keyword does not provide thread safety when non-atomic operations or composite operations are performed on shared variables. Operations like increment and decrement are composite operations.
What is the purpose of volatile keyword?
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.
When should volatile modifier be used?
The volatile modifier is used to let the JVM understand that a thread accessing the variable should always merge its own personal copy of the variable with the original in the memory. Accessing a volatile variable synchronizes all the cached copy of the variables in the main memory.
What are transient and volatile modifiers?
1) transient keyword is used along with instance variables to exclude them from serialization process. If a field is transient its value will not be persisted. On the other hand, volatile keyword is used to mark a Java variable as “being stored in main memory”.
What is the purpose of a volatile variable?
The volatile modifier is used to let the JVM know that a thread accessing the variable must always merge its own private copy of the variable with the master copy in the memory. Accessing a volatile variable synchronizes all the cached copied of the variables in the main memory.
When should you use volatile Java?
When to use it?
- You can use a volatile variable if you want to read and write long and double variable automatically.
- It can be used as an alternative way of achieving synchronization in Java.
- All reader threads will see the updated value of the volatile variable after completing the write operation.
How do you use volatile?
Volatile is used in C programming when we need to go and read the value stored by the pointer at the address pointed by the pointer. If you need to change anything in your code that is out of compiler reach you can use this volatile keyword before the variable for which you want to change the value.
Where is volatile data stored?
Volatile data can exist within temporary cache files, system files and random access memory (RAM).
Can I run a thread twice?
What happens if we don’t override Run method?
Answer: If we don’t override run() method, compiler will not flash any error and it will execute run() method of Thread class that has empty implemented, So, there will be no output for this thread.
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What is the style of the volatile?
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