Object serialization java pdf

Advantages of Serialization 1. To travel an object across a network. Only the objects of those classes can be serialized which are implementing java. Serializable is a marker interface has no data member and method.

Other examples of marker interfaces are:- Cloneable and Remote. Points to remember 1. Only non-static data members are saved via Serialization process. Static data members and transient data members are not saved via Serialization process. Constructor of object is never called when an object is deserialized. Associated objects must be implementing Serializable interface. A Serializable class can declare its own UID explicitly by declaring a field name. It must be static, final and of type long.

However it is strongly recommended that all serializable classes explicitly declare serialVersionUID value, since its computation is highly sensitive to class details that may vary depending on compiler implementations, any change in class or using different id may affect the serialized data. It is also recommended to use private modifier for UID since it is not useful as inherited member. You can run the following command to get serialVersionUID.

Skip to content. Change Language. Related Articles. Table of Contents. Improve Article. Save Article. Like Article. String name;. All of the fields in the class must be serializable. If a field is not serializable, it must be marked transient. If you are curious to know if a Java Standard Class is serializable or not, check the documentation for the class.

The test is simple: If the class implements java. Serializable, then it is serializable; otherwise, it's not. The ObjectOutputStream class is used to serialize an Object. The following SerializeDemo program instantiates an Employee object and serializes it to a file. When the program is done executing, a file named employee. The program does not generate any output, but study the code and try to determine what the program is doing. The following DeserializeDemo program deserializes the Employee object created in the SerializeDemo program.

For a JVM to be able to deserialize an object, it must be able to find the bytecode for the class. The value of the SSN field was when the object was serialized, but because the field is transient, this value was not sent to the output stream.

The SSN field of the deserialized Employee object is 0. Malhar Lathkar. Anadi Sharma. Tushar Kale. Monica Mittal. Arnab Chakraborty.