What is difference between Serializable and Externalizable?
Serializable interface passes the responsibility of serialization to JVM and the programmer has no control over serialization, and it is a default algorithm. The externalizable interface provides all serialization responsibilities to a programmer and hence JVM has no control over serialization.
What is externalization with example?
Here, externalization comes into role. It allows us o customize the serialization. For example, if we have implemented the Serialization interface in a class, we can externalize it using the writeExternal() method.
What is the difference between serialization and deserialization?
Serialization is a mechanism of converting the state of an object into a byte stream. Deserialization is the reverse process where the byte stream is used to recreate the actual Java object in memory. This mechanism is used to persist the object. The byte stream created is platform independent.
What is serialization method?
Serialization is the process of converting an object into a stream of bytes to store the object or transmit it to memory, a database, or a file. Its main purpose is to save the state of an object in order to be able to recreate it when needed. The reverse process is called deserialization.
What is externalization in Java?
Externalization in Java is used whenever you need to customize the serialization mechanism. If a class implements an Externalizable interface, then serialization of the object will be done using the method writeExternal().
What is externalization and transient?
By implementing Externalizable, you have complete control over the serialization process, that is, you can serialize whatever fields you want to. Transient fields are not serialized by the default serialization process (when implementing Serializable).
What is serialization and externalization?
Serializable is a marker interface i.e. does not contain any method. Externalizable interface contains two methods writeExternal() and readExternal() which implementing classes MUST override. Serializable interface pass the responsibility of serialization to JVM and it’s default algorithm.
What is the meaning of externalization?
Definition of externalize transitive verb. 1 : to make external or externally manifest. 2 : to attribute to causes outside the self : rationalize externalized his lack of ability to succeed.
What is difference between serialization and externalization in Java?
Externalization provides implementation logic control to the application by overriding readExternal and writeExternal methods. In serializable interface uses reflection which causes relatively slow performance. Externalizable gives full control over the implementation approach.
What is serialization 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.
What is meant by externalization in Java?
What is the difference between externalization and serialization in Java?
The class which implements java.io.Serializable interface can be serialized. On the other hand, externalization used for custom serialization based on the requirement in the application. Externalization extends java.io.Serializable.
What is the difference between Serializable interface and externalizable interface?
1 Serializable Interface is based on a recursive algorithm. 2 Serializable involves reflection mechanism to recover the object. 3 A public no-arg constructor is needed while using Externalizable. 4 Externalizable interface is fast and also consumes less memory.
What is the purpose of externalization?
Externalization give the producer of the object stream complete control over the precise class meta-data (if any) beyond the minimal required identification of the class (e. g. its name).
What are the methods of externalizable interface?
Externalizable interface contains two methods: writeExternal () and readExternal (). Serialization process: Default Serialization process will be kicked-in for classes implementing Serializable interface. Programmer defined Serialization process will be kicked-in for classes implementing Externalizable interface.