Java Input Output - IO Streams Interview Questions Answers - 1

Question: 1

What is object serialization?

Serializing an object involves encoding its state in a structured way within a byte array.

Once an object is serialized, the byte array can be manipulated in various ways; it can be written to a file, sent over a network using a socket based connection or RMI, or persisted within a database as a BLOB.

The serialization process encodes enough information about the object type within the byte stream, allowing the original object to be easily recreated upon deserialization at a later point in time.

Question: 2

What is a stream?

A Stream is an abstraction that either products or consumes information.

Question: 3

What are the types of Streams and classes of the Streams?

There are two types of Streams and they are

Byte Streams: Provide a convenient means for handling input and output of bytes.

Character Streams: provide a convenient means for handling input and output of characters.

Byte stream classes: Are defined by using two abstract classes, namely InputStream and OutputStream.

Character Streams classes: are defined by using two abstract classes, namely Reader and Writer.

Question: 4

What is serialization and deserialization?

Serialization is the process of writing the states of an object to byte stream.

Deserialization is the process of restoring these objects.

Question: 5

What is a transient variable?

A transient variable is a variable that may not be serializable.

If you don’t want some field to be serialized, you can mark the field transient or static.