IO/Serialization

Question 1

How do you serialize/deserialize an object in java?

Answer 1

You must first implement the java.io.Serializable interface. The ObjectOutputStream class contains the writeobject()/writeobject(Object objName) and readobject() method for serializing/deserializing an object, respectively.

Question 2

What is a Marker interface? What does a Serializable interface do?

Answer 2

A marker interface is an empty interface (no fields or methods). The Serializable interface is used to make an object eligible for saving its state into a file

Question 3

What are transient variables?

Answer 3

A transient variable indicates to the JVM that it is not part of the persistent state of an object/ The modifier transient can be applied to the field members of a class to turn off serialization for those members

Question 4

Difference between FileReader and Buffered Reader?

Answer 4

Filereader is used to read a file from a disk drive, whereas bufferReader is not bound to only reading files. It can be used to read data from any character stream

Question 5

List some methods in the Scanner class

Answer 5

next()
nextLine()
nextInt()
nextBoolean()
nextDouble()
nextShort()
nextFloat()