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Question 1

What is Serialization?

Answer 1

Serialization in Java is a mechanism of writing the state of an object into a byte stream. The Serializable interface is used to perform Serialization.
It is helpful when you require to save the state of a program to storage such as the file.

Question 2

What is the transient keyword?

Answer 2

If you define a data member as transient, it will not be serialized. By determining transient keyword the value of a variable need not persist when it is restored.

Question 3

What is externalizable?

Answer 3

The externalizable interface is used to write the state of an object into a byte stream in a compressed format.

Question 4

What is the difference between the Java callable interface and runnable interface?

Answer 4

A callable interface can return a result whereas a runnable interface can’t

A callable interface can throw a checked exception