Serialization and Deserialization in Java

To serialize an object means to convert its state to a byte stream so that the byte stream can be reverted back into a copy of the object. A Java object is serializable if its class or any of its superclasses implements either the java.io.Serializable interface or its subinterface, java.io.Externalizable. Deserialization is the process of converting the serialized form of an object back into a copy of the object.

For example, the java.awt.Button class implements the Serializable interface, so you can serialize a java.awt.Button object and store that serialized state in a file. Later, one can read back the serialized state and deserialize into a java.awt.Button object.

The Java platform specifies a default way by which serializable objects are serialized. A (Java) class can override this default serialization and define its own way of serializing objects of that class.

When an object is serialized, information that identifies its class is recorded in the serialized stream. However, the class's definition ("class file") itself is not recorded. It is the responsibility of the system that is deserializing the object to determine how to locate and load the necessary class files. For example, a Java application might include in its classpath a JAR file that contains the class files of the serialized object(s) or load the class definitions by using information stored in the directory, as explained later in this lesson.

Binding a Serializable Object

Serializable object can be stored in the directory if the underlying service provider supports that action, as does Oracle's LDAP service provider.

Here's an example that invokes Context.bind to bind an AWT button to the name "cn=Button". To associate attributes with the new binding, you use DirContext.bind. To overwrite an existing binding, use Context.rebind and DirContext.rebind.



Button b = new Button("Push me");

ctx.bind("cn=Button", b);
   
Object can then be read back using Context.lookup, here's how it is done:


Button b2 = (Button)ctx.lookup("cn=Button");
System.out.println(b2);
   
Following is the output, that will be produced:


# java SerObj
java.awt.Button[button0,0,0,0x0,invalid,label=Push me]
   

References : Oracle share on :        :  

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