Java Interview Guide : 200+ Interview Questions and Answers - Serialization

The video tutorial explains serialization and deserialization, processes that allow saving and retrieving the state of an object. It covers the use of the Serializable interface, the importance of the writeObject and readObject methods, and how to handle transient variables. The tutorial also discusses serializing object hierarchies and the implications of constructors not being called during deserialization. Examples are provided to illustrate these concepts.

What is the primary purpose of serialization?

• To encrypt data

• To save and retrieve the state of an object

• To compress files

• To convert an object into a string

Which method is used to serialize an object?

• convertObject

• serializeObject

• writeObject

• readObject

What is the role of the Serializable interface?

• It provides methods for serialization

• It marks a class as capable of being serialized

• It encrypts the serialized data

• It compresses the serialized data

What happens to a transient variable during serialization?

• It is encrypted

• It is not serialized

• It is compressed

• It is serialized normally

Why might a NotSerializableException occur?

• The object is too complex

• The file is too large

• The data is encrypted

• A class in the hierarchy does not implement Serializable

What is a limitation of serialization regarding static variables?

• Static variables are serialized twice

• Static variables are not serialized

• Static variables are encrypted

• Static variables are compressed

What must be done to serialize a hierarchy of objects?

• Only the top-level class needs to implement Serializable

• All classes in the hierarchy must implement Serializable

• Only the bottom-level class needs to implement Serializable

• No classes need to implement Serializable