Transient Variable in Java

Hi Vipender,

Declaring a Transient Variable

You use the transient keyword to indicate to the Java virtual machine that the indicated variable is not part of the persistent state of the object. Variables that are part of the persistent state of an object must be saved when the object is archived.

At this time, the transient marker is ignored by the Java runtime system. Future releases of the Java system will use the transient marker to implement various object archiving functions.

Like other variable modifiers in the Java system, you use transient in a class or instance variable declaration like this:

This statement declares an integer variable named hobo that is not part of the persistent state of the TransientExample class.

Transient variable can't be serialize. For example if a variable is declared as transient in a Serializable class and the class is written to an ObjectStream, the val ue of the variable can't be written to the stream instead when the class is retrieved from the ObjectStream the value of the variable becomes null

A transient variable is a variable that may not be serialized.
The transient variable is not persist when an object is stored

Please refer the below link

http://www.javabeat.net/qna/105-what-is-transient-variable-in-java/

Thanks

3 Replies

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Vulpes14y ago
May I just clarify a point in Satyapriya's post which may be puzzling you.

Although 'transient' has always been a Java keyword, it was not used until (I think) version 1.1 but has certainly been in use now for a good many years.

Java also has two keywords which have never been used at all - and probably never will be - namely 'const' and 'goto'.
Satyapriya Nayak14y ago
Hi Vipender,

Declaring a Transient Variable

You use the transient keyword to indicate to the Java virtual machine that the indicated variable is not part of the persistent state of the object. Variables that are part of the persistent state of an object must be saved when the object is archived.

At this time, the transient marker is ignored by the Java runtime system. Future releases of the Java system will use the transient marker to implement various object archiving functions.

Like other variable modifiers in the Java system, you use transient in a class or instance variable declaration like this:

This statement declares an integer variable named hobo that is not part of the persistent state of the TransientExample class.

Transient variable can't be serialize. For example if a variable is declared as transient in a Serializable class and the class is written to an ObjectStream, the val ue of the variable can't be written to the stream instead when the class is retrieved from the ObjectStream the value of the variable becomes null

A transient variable is a variable that may not be serialized.
The transient variable is not persist when an object is stored

Please refer the below link

http://www.javabeat.net/qna/105-what-is-transient-variable-in-java/

Thanks
Vulpes14y ago
When an object is serialized, any member variables to which the 'transient' keyword is applied are excluded from the serialization process. Their original values will therefore be lost when the object is deserialized.