What is volatile and transient in Java?

What is difference between volatile and transient?

In this article, we will see the difference between the keywords volatile and transient.


Transient Volatile
It cannot be used with the static keyword as static variable do not belong to individual instance. During serialization, only object’s current state is concerned. It can be used with the static keyword.

What is transient in Java?

transient is a variables modifier used in serialization. At the time of serialization, if we don’t want to save value of a particular variable in a file, then we use transient keyword. When JVM comes across transient keyword, it ignores original value of the variable and save default value of that variable data type.

What is transient in Java example?

transient variable in Java is a variable whose value is not serialized during Serialization and which is initialized by its default value during de-serialization, for example for object transient variable it would be null.

What is difference between transient and static?

The main difference between the two ( static versus transient ) is that static variables exist only once per transaction, but transient variables can exist many times. In other words, static variables have a global scope, while transient variables have a local scope.

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What is the purpose of keyword volatile?

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.

Why do we use volatile and transient keywords in Java?

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 transient value?

A transient value is a wrapper around a value allocated by a disposable that allows users of the value to have some limited control over its lifecycle. In particular, users of a transient may: Eagerly dispose the value with transient-dispose.

What are transient fields?

transient Fields: Variables may be marked transient to indicate that they are not part of the persistent state of an object. For example, you may have fields that are derived from other fields, and should only be done so programmatically, rather than having the state be persisted via serialization.

Can a method be transient?

transient can only be applied to member variables and not to methods so there is a problem here.

What do you mean by transient?

Adjective. transient, transitory, ephemeral, momentary, fugitive, fleeting, evanescent mean lasting or staying only a short time. transient applies to what is actually short in its duration or stay.

What is the need of transient code with example?

The transient keyword can be used with the data members of a class in order to avoid their serialization. For example, if a program accepts a user’s login details and password. But we don’t want to store the original password in the file.

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What are the transient variables?

A transient variable is a variable that can not be serialized. According to Java Language Specification [jls-8.3. 1.3] – “Variables may be marked transient to indicate that they are not part of the persistent state of an object.”

Can you serialize static fields of a class?

In Java, serialization is a concept using which we can write the state of an object into a byte stream so that we can transfer it over the network (using technologies like JPA and RMI). But, static variables belong to class therefore, you cannot serialize static variables in Java.

Can we serialize static fields?

A static variable cannot be serialized. While de-serializing a value can be available for Static variables if the same is provided while initialization of the base class. It doesn’t mean that static variable will be serialized.

What Cannot be serialized in Java?

All transient and static fields do not get serialized. … We can override the default serialization behaviour inside our Java class by providing the implementation of writeObject and readObject methods. And we can call ObjectOutputStream. defaultWriteObject() and ObjectInputStream.