Interview Questions and Answers for 'At' | Search Interview Question

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Q1111. What is a csrf token ? What is it used for ?

Ans. A CSRF token is a unique, secret, unpredictable value that is generated by the server-side application and transmitted to the client in such a way that it is included in a subsequent HTTP request made by the client. When the later request is made, the server-side application validates that the request includes the expected token and rejects the request if the token is missing or invalid.

CSRF tokens can prevent CSRF attacks by making it impossible for an attacker to construct a fully valid HTTP request suitable for feeding to a victim user. Since the attacker cannot determine or predict the value of a user's CSRF token, they cannot construct a request with all the parameters that are necessary for the application to honor the request.

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Q1112. Difference between XSS and CSRF ?

Security

Ans. SRF attack requires an authenticated session, whereas an XSS attack doesn’t.
XSS doesn’t require any user interaction.CSRF is restricted to the actions the victim can perform.
XSS requires a vulnerability to happen, whereas CSRF relies on tricking the user to click a link or access a page.
CSRF can only send an HTTP request but cannot view the response. XSS can send and receive HTTP requests and responses to extract the required data.

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Q1113. What is SameSite cookie attribute ?

Security

Ans. SameSite cookie attribute is used by browsers to identify how first- and third-party cookies should be handled.

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Q1114. How do you evaluate a product while migrating to open source ?

^{This question was recently asked at 'Royal Bank of Scotland (RBS),RBS India'.This question is still unanswered. Can you please provide an answer.}

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Q1115. Interface vs Abstraction

Core Java

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Q1116. How to debug multi server deployed application ?

Debugging

Ans. Choose the server from the list of defined servers under J2EE Server.
Choose the project to debug.
Click Apply to save changes.
Click Debug to start the server and run the application.

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Q1117. Design pattern used in struts.

Struts

Ans. Struts controller uses the Command design pattern and the action classes use the Adapter design pattern. The process() method of the RequestProcessor uses the Template method design pattern.

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Q1118. What is the main difference between unique key and primary key ?

Database

Ans. Primary key will not accept NULL values whereas Unique key can accept one NULL value.

A table can have only primary key whereas there can be multiple unique key on a table.

A Clustered index automatically created when a primary key is defined whereas Unique key generates the non-clustered index.

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Q1119. Which change detection strategy do you use in your application and Why ?

Angular

Ans. We use ChangeDetectionStrategy.Push

As the application grows bigger , The default change detection strategy could become a performance overhead and hence should be avoided.

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Q1120. What are the different conditions that triggers view update in case of push ChangeDetectionStrategy ?

Angular

Ans. 1. Any change in Input
2. Any even originating from the component or it's child components
3. Explicit trigger

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Q1121. What is interpolation in Angular ?

Angular

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Q1122. Can we use interpolation with all data types ?

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Q1123. What are the limitations with using interpolation ? Why do we need property binding ?

Ans. Interpolation can only work with String types and hence we need property binding while working with other data types.

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Q1124. What are the libraries and tools for cloud storage on GCP ?

Google Cloud Platform (GCP)

Ans. Console - GUI Interface
gsutil - Command Line Interface
Rest API - Using JSON or XML API

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Q1125. What do you know about Google Compute Engine ?

Google Cloud Platform (GCP)

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Q1126. How are the Google Compute Engine and Google App Engine related ?

Google Cloud Platform (GCP)

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Q1127. How does the pricing model work in GCP cloud ?

Google Cloud Platform (GCP)

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Q1128. What are the different methods for the authentication of Google Compute Engine API ?

Google Cloud Platform (GCP)

Ans. MS active directory concept and in GCP its Cloud Identity

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Q1129. What is Google BigQuery? What are the benefits of BigQuery for the data warehouse practitioners ?

Google Cloud Platform (GCP)

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Q1130. Can you share some of the best practices while designing authentication and authorization system ?

Authentication

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Q1131. Can we do a thread specific heap allocation ?

Memory Management

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Q1132. Do you ever merge changes from one feature branch to another ? Why ?

SCM

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Q1133. How can we create objects if we make the constructor private ?

Core Java

a. We can't create objects if constructor is private

b. We can only create objects if we follow singleton pattern

c. We can only create one object

d. We can create new object through static method or static block

Ans.d. We can create new object through static method or static block

Q1134. What will be the output of executing following class ?

public class BuggyBread {

static {
System.out.println("Static Block");
}

{
System.out.println("Initialization Block");
}

BuggyBread(){
System.out.println("Constructor");
}

public static void main(String[] args){
System.out.println("Main Method");
}
}

Core Java

a. Static Block
Main Method

b. Static Block
Instance Initialization Block
Main Method

c. Static Block
Constructor
Main Method

d. Static Block
Instance Initialization Block
Constructor
Main Method

Ans.a. Static Block
Main Method

Q1135. What will be the output upon executing following class ?

public class BuggyBread {

static {
System.out.println("Static Block");
}

{
System.out.println("Instance Initialization Block");
}

BuggyBread(){
System.out.println("Constructor");
}

public static void main(String[] args){
System.out.println("Main Method");
new BuggyBread();
}
}

Core Java

a. Instance Initialization Block
Constructor
Static Block
Main Method

b. Static Block
Instance Initialization Block
Constructor
Main Method

c. Main Method
Static Block
Instance Initialization Block
Constructor

d. Static Block
Main Method
Instance Initialization Block
Constructor

Ans.d. Static Block
Main Method
Instance Initialization Block
Constructor

Q1136. With the following code, Which is a valid way to initialize ?
public class BuggyBread {

   private String element1;

   private String element2;

   private BuggyBread(String element1, String element2){
      this.element1 = element1;
      this.element2 = element2;
   }

   public static class Builder {

      private String element1;

      private String element2;

      Builder(BuggyBread buggybread){
         element1 = buggybread.element1;
         element2 = buggybread.element2;
      }

      Builder withElement1(String element1){
         this.element1 = element1;
         return this;
      }

      Builder withElement2(String element2){
         this.element2 = element2;
         return this;
      }

      BuggyBread build(){
         BuggyBread buggybread = new BuggyBread(element1,element2);
         return buggybread;
      }
   }
}

Core Java

a. BuggyBread buggybread = new BuggyBread();

b. BuggyBread buggybread = new BuggyBread("element1","element2");

c. BuggyBread.Builder builder = new BuggyBread.Builder();

d. BuggyBread.Builder builder = new BuggyBread.Builder("element1","element2");

Ans.d. BuggyBread.Builder builder = new BuggyBread.Builder("element1","element2");

Q1137. What will be the output of following ?

public class BuggyBread {

   private int x;
   private Integer y;

   BuggyBread(int x,int y){};

   public static void main(String[] args){
      BuggyBread buggybread = new BuggyBread(1,2);
      System.out.println(buggybread.x);
      System.out.println(buggybread.y);
   }
}    Reference

Core Java

a. 0 0

b. 0 null

c. null 0

d. null null

Ans.b. 0 null

Q1138. Which of the following is true for == operator ?

Core Java

a. For primitives, == checks if the variables on left and right have same data type

b. For primitives, == checks if the variables on left and right have same value

c. For Objects, == checks if the references on left and right have same data type

d. For Objects, == checks if the references on left and right have same value

Ans.b. For primitives, == checks if the variables on left and right have same value

Q1139. Which of the following is equivalent to following logic ?

Not X && Not Y

Core Java

a. x || Y

b. Not(X || Y)

c. Not(X && Y)

d. Not X && Y

Ans.b. Not(X || Y)

Q1140. Which of the following http response means the resource is not found ?

Java EE

a. 500

b. 200

c. 404

d. 400

Ans.c. 404

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