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Thread: what is the use of transient class and serializable interface?

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    Default what is the use of transient class and serializable interface?

    hi everybady,
    i want to know, what is the use of transient, valatile keywords in java
    and what is the use of serializable interface?
    where and how we preserve the state of the object?


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    Default Re: what is the use of transient class and serializable interface?

    Transient means something is invisible to serialization.

    Volatile information can be found at Java theory and practice: Managing volatility

    Serializable is a marker interface to mark a class as serializable.

    You can preserve the state of an object by using some sort of persistence like a database or file.

    Here is an interface for this thread.

    public interface Googleable {
        public List<GoogleResults> search(final String query);
    }

    // Json

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    Default Re: what is the use of transient class and serializable interface?

    Transient is keyword, it is member variable of the class. This variable not persist when an object are stored or Serialized.
    Serialization is an interface by which you can save the state of an object by converting it to a byte stream. Objects are passing through the network in byte format. This is Usage of Serialization interface.

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    Default Re: what is the use of transient class and serializable interface?

    Serialization is a way to store or transmit Java objects. Since objects refer to other objects, serialization recursively saves the "entire" object. Serialized objects can be saved to a disk file or sent over a communications link. "Reading" the result is then called deserialization, where the original object is reconstructed. If the object is stored to a disk file, the file is readable via Java, but nothing else.

    Transient is something you use to tag a field that you do not want serialized. The simplest case would be a field that you plan to recompute each time, such as a sequence number, or a time field. If this value wouldn't be the same or make sense the next time you deserialize a class you could should use transient. Transient can also be used to tag a reference field so that serialization ignores this object. You might want to do this to reduce the amount of serialized data.

    Volatile has nothing to do with serialization, but does have something to do with synchronization and threading.

    Tom

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