Why do we use transient keyword 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 the purpose of transient keyword 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 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 is difference between transient and volatile in Java?

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.

How do you define a transient variable in Java?

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.

Can we use transient keyword with class in Java?

You can use transient keyword in classes with fields which needs to be secured or calculated on existing state fields. And use it when it simply doesn’t make sense to serialize those fields such as loggers and threads.

What is serialization used for?

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. The reverse process is called deserialization.

Can transient variable be serialized?

Yes, transient member can be serialized.

What are the disadvantages of transient keyword?

static variables are not part of the state of the object so the transient keyword cannot apply. final variables are already serialized by their values so again transient cannot apply.

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Can we serialize static variables in Java?

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.

Why are transient variables not serialized?

In case you define any data member as transient, it will not be serialized. This is because every field marked as transient will not be serialized. You can use this transient keyword to indicate the Java virtual machine (JVM) that the transient variable is not part of the persistent state of an object.

Is transient variable thread safe in Java?

Access to volatile int in Java will be thread-safe.

What is difference between volatile and static?

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.

What are transient variables?

A transient variable is a special type of variable which we create by using the transient keyword. It is a special type of variable which have a non-serialized value at the time of serialization. A variable that is initialized by its default value during de-serialization is known as a transient variable.

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.

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What is a 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.