Top 25 Jackson Multiple Choice Questions (MCQs) with Answers

1 .

Jackson library was created by ____?

A)

Tatu Saloranta.

B)

Tatrya Saloranta.

C)

Samoi Saloranta.

D)

None of the above

Correct Answer : Tatu Saloranta.

Explanation : Jackson library was created by Tatu Saloranta.

2 .

Which programming language is the foundation of the Jackson Library?

A)

C#

B)

C++

C)

Java

D)

Python

Correct Answer : Java

Explanation : Java is the foundation of the Jackson library.

3 .

Which of the following companies use Jackson?

A)

IBM

B)

Netflix

C)

Google

D)

All of the above

Correct Answer : All of the above

Explanation : Following companies use Jackson :

* IBM
* Netflix
* Google
* Amazon

4 .

Which of the following are the alternative of Jackson?

A)

Gson

B)

Boon

C)

Json.simple

D)

All of the above

Correct Answer : All of the above

Explanation : Following are the alternatives of Jackson :

* Gson
* Boon
* Json.simple

5 .

Which of the following is the file extension of JSON?

A)

.csv

B)

.xml

C)

.json

D)

.jackson

Correct Answer : .json

Explanation : .json is the file extension of JSON.

6 .

Does Jackson support data binding?

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : Yes

Explanation : Yes, Jackson library supports the data binding concept.

7 .

How many ways does Jackson provide to process JSON?

A)

2

B)

3

C)

4

D)

5

Correct Answer : 3

Explanation : Jackson offers three methods for processing JSON :

* Streaming API
* Tree Model
* Data Binding

8 .

Is Jackson library open-source?

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : Yes

Explanation : Jackson library is open-source and free to use.

9 .

Is there any additional library required by the Jackson library outside the JDK?

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : No

Explanation : Jackson library does not require any other library apart from JDK.

10 .

What is POJO?

A)

Program oriented java object

B)

Programming object java oriented

C)

Plain old java object

D)

None of the above

Correct Answer : Plain old java object

Explanation : POJO stands for plain old java object.

11 .

Which of the following annotations should be used to indicate the name of the POJO to be serialized?

A)

@JsonRoot

B)

@RootPojo

C)

@RootObject

D)

@JsonRootName

Correct Answer : @JsonRootName

Explanation : @JsonRootName annotations should be used to indicate the name of the POJO to be serialized.

12 .

How many types of data binding does Jackson support?

A)

2

B)

3

C)

4

D)

5

Correct Answer : 2

Explanation : Jackson library supports two types of binding:

* Simple data binding
* Full data binding

13 .

JSON is converted into Map, List, String, Number, Boolean, and null objects using ____ binding.

A)

Full data binding

B)

Simple data binding

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Simple data binding

Explanation : JSON is converted into Map, List, String, Number, Boolean, and null objects using Simple Data Binding.

14 .

The primary actor class in the Jackson library is ____?

A)

JackonBinder

B)

DataMapper

C)

ObjectMapper

D)

None of the above

Correct Answer : ObjectMapper

Explanation : The primary actor class in the Jackson library is ObjectMapper.

15 .

@JsonAnyGetter, @JsonGetter, @JsonValue are the which type of annotations?

A)

Deserialization

B)

Serialization

C)

Type Handling

D)

Property Inclusion

Correct Answer : Serialization

Explanation : Following are the serialization annotations:@JsonAnyGetter, @JsonGetter, @JsonValue, @JsonValue, @Serialize.

16 .

@JsonCreator, @JacksonInject are which type of annotations?

A)

Deserialization

B)

Serialization

C)

Type Handling

D)

Property Inclusion

Correct Answer : Deserialization

Explanation : Some of the deserialization annotations are:@JsonCreator, @JacksonInject, @JsonSetter.

17 .

Which of the following is the property inclusion annotation?

A)

@JsonValue

B)

@JsonCreator

C)

Both (A) and (B)

D)

@JsonInclude

Correct Answer : @JsonInclude

Explanation : Some of the property inclusion annotations are:@JsonInclude, @JsonIgnore, @JsonAutoDetect.

18 .

______ Binding can convert JSON to any Java type and vice versa?

A)

Full data binding

B)

Simple data binding

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Full data binding

Explanation : Full Data Binding can convert JSON to any Java type and vice versa.

19 .

For constructing Tree Model, do we need the ____ class?

A)

JackonBinder

B)

DataMapper

C)

ObjectMapper

D)

None of the above

Correct Answer : ObjectMapper

Explanation : For constructing Tree Model, we need the ObjectMapper class.

20 .

The process of transforming a Java object into its JSON representation is known as ______?

A)

POJO

B)

Serialisation

C)

Deserialisation

D)

ObjectMapper

Correct Answer : Serialisation

Explanation : The process of transforming a Java object into its JSON representation is known as serialisation.

21 .

The process of turning a JSON string into a Java object is known as ______.

A)

POJO

B)

Serialisation

C)

Deserialisation

D)

ObjectMapper

Correct Answer : Deserialisation

Explanation : The process of turning a JSON string into a Java object is known as deserialization.

22 .

____ creates an in-memory tree representation of the JSON content.

A)

Tree Model

B)

Annotations

C)

DataMapper

D)

Streaming API

Correct Answer : Tree Model

Explanation : The tree Model creates an in-memory tree representation of the JSON content.

23 .

@JsonTypeInfo, @JsonSubTypes comes under which type of annotations?

A)

Serialization

B)

Type handling

C)

General annotation

D)

Property Inclusion annotation

Correct Answer : Type handling

Explanation : Some of the type handling annotations are:@JsonTypeInfo, @JsonSubTypes.

24 .

Which of the following annotations indicates which fields of a Java object, based on their values, should be included or omitted during serialization?

A)

@Json

B)

@Include

C)

@IncludeJson

D)

@JsonInclude

Correct Answer : @JsonInclude

Explaination : @JsonInclude annotations indicate which fields of a Java object, based on their values, should be included or omitted during serialization.