Cognizant
100+ Matrix Solutions Interview Questions and Answers
Q101. What is java 8 features
Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.
Lambda expressions allow you to write code in a more concise and readable way.
Functional interfaces are interfaces with a single abstract method, which can be implemented using lambda expressions.
Streams provide a way to work with sequences of elements and perform operations like filter, map, and reduce.
Default methods allow interfaces to have method implem...read more
Q102. wht is the use of enum?
Enums are used to define a set of named constants, making code more readable and maintainable.
Enums help in improving code readability by giving meaningful names to constants
They provide type safety by restricting variables to only hold values from the defined set
Enums can be used in switch statements to handle different cases easily
Q103. What is sequence
A sequence is a ordered list of elements or events following a specific pattern or order.
A sequence can be in ascending or descending order.
Examples include Fibonacci sequence, arithmetic progression, and DNA sequence.
Sequences can be finite or infinite.
Q104. What is the class?
A class is a blueprint for creating objects that have similar attributes and methods.
A class is a user-defined data type that encapsulates data and functions.
It is a template for creating objects.
It provides a way to organize and structure code.
Objects are instances of a class.
Classes can inherit properties and methods from other classes.
Examples include String, Integer, and List in Java.
Q105. why we use mvc ?
MVC is used to separate concerns in software development, making code more organized and maintainable.
Separates concerns of data, presentation, and logic
Improves code reusability and maintainability
Enhances testability of the application
Promotes scalability and flexibility
Examples: ASP.NET MVC, Ruby on Rails, Spring MVC
Q106. What is java explain
Java is a high-level, object-oriented programming language used for developing applications and software.
Java is platform-independent and can run on any operating system
It is used for developing desktop, web, and mobile applications
Java code is compiled into bytecode which can be run on any Java Virtual Machine (JVM)
Java has a vast library of pre-built classes and APIs for developers to use
Java is used by companies such as Google, Amazon, and Netflix for their applications
Q107. reverse an array
Reverse an array of strings
Iterate through the array from both ends and swap the elements
Continue swapping until the middle of the array is reached
Q108. How to declare file
To declare a file in software development, you typically need to specify the file type, name, and location.
Use a file declaration statement in the programming language you are using (e.g. 'File myFile = new File("example.txt");' in Java)
Specify the file type if necessary (e.g. '.txt' for text files, '.csv' for CSV files)
Provide the file name and location within the declaration statement (e.g. 'example.txt' or 'C:/Users/User/Documents/example.txt')
Q109. Whay do we use object
Objects are used in software engineering to represent real-world entities and encapsulate data and behavior.
Objects help organize code by grouping related data and functions together
Objects promote code reusability through inheritance and polymorphism
Objects allow for easier maintenance and updates by encapsulating data and behavior
Examples: a Car object with properties like make, model, and methods like start(), stop()
Examples: a User object with properties like username, em...read more
Q110. Abstraction vs encasulation
Abstraction focuses on hiding unnecessary details, while encapsulation focuses on bundling data and methods together.
Abstraction allows us to focus on what an object does, rather than how it does it.
Encapsulation helps in data hiding and prevents direct access to the internal state of an object.
Abstraction is achieved through interfaces and abstract classes, while encapsulation is achieved through access modifiers like private and protected.
Example of abstraction: a car's int...read more
Q111. Say about dbms joins ,types?
DBMS joins are used to combine data from multiple tables based on a related column.
Types of DBMS joins include inner join, left join, right join, and full outer join.
Inner join returns only the matching records from both tables.
Left join returns all records from the left table and the matching records from the right table.
Right join returns all records from the right table and the matching records from the left table.
Full outer join returns all records from both tables, inclu...read more
Q112. What is birth place
Birth place refers to the location where a person is born.
Birth place is typically recorded on a person's birth certificate.
It can be a city, town, hospital, or even a specific address.
Some people may be born in unconventional places like a car or airplane.
Q113. Explain the oops concepts
OOPs concepts are fundamental principles of object-oriented programming that help in organizing and designing code.
Encapsulation: Bundling data and methods that operate on the data into a single unit (class).
Inheritance: Ability of a class to inherit properties and behavior from another class.
Polymorphism: Ability to present the same interface for different data types.
Abstraction: Hiding the complex implementation details and showing only the necessary features to the outside...read more
Q114. Advantages of collections
Collections provide efficient data storage and manipulation in programming.
Allow for easy organization and retrieval of data
Provide various data structures like lists, sets, maps, etc.
Enable operations like sorting, searching, filtering, and iteration
Improve code readability and maintainability
Examples: ArrayList, HashMap, TreeSet
Q115. What is immutability
Immutability refers to the state of an object or data structure that cannot be modified after it is created.
Immutability ensures that once an object is created, its state cannot be changed.
Immutable objects are thread-safe and can be shared without the risk of unintended modifications.
Examples of immutable data structures include strings and tuples in Python.
Functional programming languages like Haskell promote immutability to avoid side effects.
Q116. 2. Explain the OOPs concepts
OOPs concepts are the fundamental principles of Object-Oriented Programming.
Abstraction: Hiding implementation details and showing only necessary information.
Encapsulation: Binding data and functions together to protect data from outside interference.
Inheritance: Acquiring properties and behavior of a parent class by a child class.
Polymorphism: Ability of an object to take many forms or have multiple behaviors.
Q117. scenario for terraform
Using Terraform to automate infrastructure provisioning
Terraform is an infrastructure as code tool used to define and provision infrastructure
It uses declarative configuration files to define the desired state of the infrastructure
Terraform supports various cloud providers like AWS, Azure, and Google Cloud
Example: Define AWS EC2 instance using Terraform configuration file
Q118. Api gateway explanation
API Gateway is a server that acts as an entry point for APIs.
API Gateway is a reverse proxy that routes requests to the appropriate backend service.
It can handle authentication, rate limiting, and caching.
Examples include AWS API Gateway, Kong, and Apigee.
Q119. WANT TO RELOCATE
Yes, I am open to relocating for the right opportunity.
I am willing to consider relocation if the job aligns with my career goals.
I am open to exploring new cities and cultures.
I am willing to relocate for a better work-life balance or career advancement opportunities.
Q120. Explain y cognizant
Cognizant is a multinational corporation that provides IT services, including consulting, technology, and outsourcing.
Cognizant offers a wide range of services such as digital solutions, consulting, and business process outsourcing.
The company is known for its expertise in areas like artificial intelligence, cloud computing, and cybersecurity.
Cognizant serves clients in various industries such as healthcare, financial services, and retail.
The company has a global presence wit...read more
Q121. explain cicd process
CI/CD process stands for Continuous Integration/Continuous Deployment, which is a software development practice to automate the process of integrating code changes and deploying them to production.
Continuous Integration (CI) involves automatically building and testing code changes as they are committed to a shared repository.
Continuous Deployment (CD) involves automatically deploying code changes to production environments after passing the CI tests.
CI/CD pipelines are typica...read more
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