实现可序列化的Java Transferable对象

Question

If we need to transfer an Object across network we make the class implements Serializable . Now my question is what difference does it make?How it all works?

Answer 1

In brief, There are cases when you want to transfer an object but want not to transfer all the fields of the object. Then you make the class implementing Serializable, that is a marker that any object of that class may be sent over a network. The fields inside the class that you want to to restrict from from transferring over network, mark them as transient with the keyword transient . Those fields may have get default values on other end.

You may see Serializable and transient for answer to why implement an interface in one place and keyword in other olac.

For more details see documentation by oracle on Serializable

documentation by oracle on transient

Thanks.

Answer 2

Below paragraph describes what Serilization is (Taken from book Effective Java).

Serilization provides a framework for encoding objects as byte streams and reconstructing objects from their byte-stream encodings. Encoding an object as a byte stream is known as serializing the object; the reverse process is known as deserializing it. Once an object has been serialized, its encoding can be transmitted from one running virtual machine to another or stored on disk for later deserialization. Serialization provides the standard wire-level object representation for remote communication, and the standard persistent data format for the JavaBeans component architecture.

You can read java docs or any other standard java book(for example Head First java) to know what Serilization is and how it works.