Infinx Quality Analyst Interview Questions and Answers for Experienced

SQL joins, bst, traversal

Q1. Project related questions
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Q2. Questions asked from resume
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Q1. Basics of Core Java,Inheritance ,abstraction
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Q2. Handling data in JAVA API
Ans. 
JAVA API provides various classes and methods to handle data effectively.
• Use classes like BufferedReader, FileReader, and Scanner to read data from files.

• Use classes like BufferedWriter, FileWriter, and PrintWriter to write data to files.

• Use classes like ArrayList and HashMap to store and manipulate data in memory.

• Use classes like ResultSet and PreparedStatement to interact with databases.

• Use classes like JsonParser an...read more
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Q1. Handling code review
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Q2. Performance issues in project
Ans. 
Performance issues in a project can arise due to various reasons.
• Identify the root cause of the issue

• Analyze the impact of the issue on the project timeline and budget

• Implement corrective actions to resolve the issue

• Monitor the performance regularly to avoid future issues
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Q3. Project scaling
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Q1. Salary package discussions
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Focus on all basic aptitude concepts

Q1. Stack parenthesis
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Q1. Have you attended hackerrank
Ans. 
Yes, I have attended Hackerrank for coding challenges and practice.
• I have completed coding challenges on Hackerrank to practice my skills

• I have participated in coding competitions on Hackerrank

• I have used Hackerrank to prepare for technical interviews
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IQ test conducted inside office

Group discussioin about a common topic

Q1. Machine learning questions
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Q2. Decision trees, random forest
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Q1. ML Ops related questions
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Q1. Basic java array list iteration, generics, stream api, java8 features
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Q1. How would you tell a complete Java beginner the difference between set, list and map?
Ans. 
Set is a collection of unique elements, List is an ordered collection of elements, and Map is a collection of key-value pairs.
• Set does not allow duplicates, e.g. a set of integers {1, 2, 3, 4, 5}

• List maintains the order of elements, e.g. a list of names ['John', 'Mary', 'Bob']

• Map stores key-value pairs, e.g. a map of phone numbers {'John': '123-456-7890', 'Mary': '987-654-3210'}
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Q2. How would you train a complete beginner in Java to write their first program?
Ans. 
To train a beginner in Java, start with basic concepts and gradually introduce programming concepts.
• Start with basic concepts like data types, variables, and operators

• Introduce control structures like if-else statements and loops

• Teach object-oriented programming concepts like classes and objects

• Encourage practice and experimentation with simple programs

• Provide resources like online tutorials and exercises

• Offer guidance
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Q3. What is microservices advantages and basic architecture?
Ans. 
Microservices are a software architecture approach where applications are built as a collection of small, independent services.
• Advantages include increased scalability, flexibility, and resilience

• Each service can be developed, deployed, and scaled independently

• Allows for easier maintenance and updates

• Basic architecture involves breaking down a monolithic application into smaller, self-contained services

• Services communi
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Q4. Why is main method static? Can we write static public void main()?
Ans. 
Main method is static because it needs to be called without creating an instance of the class.
• Static methods can be called without creating an instance of the class

• Main method is the entry point of the program

• Main method must have a specific signature: public static void main(String[] args)

• args is an array of strings that can be used to pass command line arguments to the program
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Q5. Asked about current role and responsibilities.
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Q6. Basic cloud concepts like compute, load balancing, container orchestration and deploying on cloud.
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Q7. How would you develop a springboot application?
Ans. 
To develop a Spring Boot application, follow these steps:
• Create a new Spring Boot project using Spring Initializr

• Define the necessary dependencies in the pom.xml file

• Create the necessary Java classes and packages

• Define the application properties in the application.properties file

• Run the application using the Spring Boot Maven plugin or by running the main class

• Test the application using a web browser or a REST client
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Q8. What is the difference between JDK, JRE and JVM?
Ans. 
JDK is a development kit, JRE is a runtime environment, and JVM is a virtual machine that executes Java code.
• JDK includes JRE and development tools

• JRE includes JVM and necessary libraries

• JVM interprets compiled Java code into machine code

• JDK is needed for developing Java applications

• JRE is needed for running Java applications

• Multiple JVMs can run on a single machine
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Q9. Write a program to check if a number is prime or not.
Ans. 
Program to check if a number is prime or not.
• A prime number is only divisible by 1 and itself.

• Loop through numbers from 2 to n-1 and check if n is divisible by any of them.

• If n is divisible by any number, it is not prime.

• If n is not divisible by any number, it is prime.
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Q1. Why do you want to join us?
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Q2. Current roles and responsibilities.
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Q3. Asked if comfortable for location?
Ans. You should say yes to the offered location, but also mention your preferred one as well.
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