Which of the following best cases use Externalizable interface in Java?

Which of the following best cases use Externalizable interface in Java?

We can achieve custom serialization with the Serializable interface by marking the field with transient keyword. The JVM won’t serialize the particular field but it’ll add up the field to file storage with the default value. That’s why it’s a good practice to use Externalizable in case of custom serialization.

What is Serializable and Externalizable interfaces?

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. Externalizable provides control of serialization logic to programmer – to write custom logic.

What is serialization explain with example?

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.

How many methods are there in the Externalizable interface?

two methods
Externalizable interface contains two methods: writeExternal() and readExternal(). Process: Default Serialization process will take place for classes implementing Serializable interface.

What is Externalizable interface in Java?

Java Programming Java8Object Oriented Programming. Externalization is used whenever we need to customize serialization mechanism. If a class implements an Externalizable interface then, object serialization will be done using writeExternal() method.

What is serialization in PHP with example?

Serializing an object means converting it to a bytestream representation that can be stored in a file. This is useful for persistent data; for example, PHP sessions automatically save and restore objects. $encoded = serialize(something); $something = unserialize(encoded);

Why Externalizable is used in Java?

Externalization is used whenever we need to customize serialization mechanism. If a class implements an Externalizable interface then, object serialization will be done using writeExternal() method. At the receiver’s end, the serializable object is reconstructed using ObjectInputStream. …

What is the difference between externalizable and Serializable interface in Java?

The key difference here is how we handle the serialization process. When a class implements the java.io.Serializable interface, the JVM takes full responsibility for serializing the class instance. In case of Externalizable, it’s the programmer who should take care of the whole serialization and also deserialization process.

What are the methods of externalizable interface?

Externalizable interface contains two methods: writeExternal () and readExternal (). Process: Default Serialization process will take place for classes implementing Serializable interface. Programmer defined Serialization process for classes implementing Externalizable interface.

What is the use of externalization in Java?

Externalization is used whenever we need to customize serialization mechanism. If a class implements an Externalizable interface then, object serialization will be done using writeExternal () method.

What is readexternalizable interface in Java?

Externalizable interface present in java.io, is used for Externalization which extends Serializable interface. It consist of two methods which we have to override to write/read object into/from stream which are- // to read object from stream void readExternal (ObjectInput in) // to write object into stream void writeExternal (ObjectOutput out)