Is Externalizable a marker interface?

The externalizable interface is not a marker interface and thus it defines two methods writeExternal() and readExternal(). Serializable interface passes the responsibility of serialization to JVM and the programmer has no control over serialization, and it is a default algorithm.

What is Externalizable interface?

Externalizable is an interface that enables you to define custom rules and your own mechanism for serialization. Before understanding Externalizable interface, you need to have idea about Serialization. Java Serialization provides default functionality to store and later recreate the object.

Is Externalizable a marker interface and does not consist of any methods?

Methods : Serializable is marker interface without any methods. Externalizable interface contains two methods: writeExternal() and readExternal(). Process: Default Serialization process will take place for classes implementing Serializable interface.

Which is the marker interface?

A marker interface is an interface that has no methods or constants inside it. It provides run-time type information about objects, so the compiler and JVM have additional information about the object. A marker interface is also called a tagging interface.

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. Serializable interface pass the responsibility of serialization to JVM and it’s default algorithm.

What is Externalizable interface in Java with example?

Interface Externalizable The writeExternal and readExternal methods of the Externalizable interface are implemented by a class to give the class complete control over the format and contents of the stream for an object and its supertypes. These methods must explicitly coordinate with the supertype to save its state.

Which is the best case to use the 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.

Which of the following is not a marker interface?

2. Which of the following is not a marker interface? Explanation: Reader is not a marker interface. Serializable, Cloneable and Remote interfaces are marker interface.

Is cloneable a marker interface?

Java supports object cloning using the “Cloneable” interface. The cloneable interface is a marker interface and is a part of the java. lang package. When a class implements the Cloneable interface, then it implies that we can clone the objects of this class.

What is serializable interface in Java?

The Serializable interface is present in java.io package. It is a marker interface. A Marker Interface does not have any methods and fields. Thus classes implementing it do not have to implement any methods. Classes implement it if they want their instances to be Serialized or Deserialized.

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 serializable and Externalizable in Java?