60+ Teleperformance Interview Questions and Answers

Deadlock is a situation where two or more processes are unable to proceed because they are waiting for each other to release resources.

• Deadlock occurs when two or more processes are blocked and unable to proceed.

• It happens when each process is holding a resource and waiting for another resource to be released.

• There are four necessary conditions for deadlock: mutual exclusion, hold and wait, no preemption, and circular wait.

• Examples of resources that can cause deadlock include...read more

I have used blue-green deployment strategy in previous projects.

• Blue-green deployment involves running two identical production environments, with one active and one inactive.

• Switching between the two environments allows for zero downtime deployments and easy rollback in case of issues.

• I have implemented blue-green deployment using tools like Kubernetes and Jenkins in past projects.

I have experience with a variety of devops tools including Jenkins, Docker, Kubernetes, Ansible, and Terraform.

• Jenkins

• Docker

• Kubernetes

• Ansible

• Terraform

Checked and Unchecked Exceptions are types of exceptions in Java. Checked exceptions are checked at compile-time while unchecked exceptions are not.

• Checked exceptions are those which are checked at compile-time and must be handled by the programmer using try-catch or throws keyword.

• Examples of checked exceptions include IOException, SQLException, ClassNotFoundException.

• Unchecked exceptions are those which are not checked at compile-time and can occur at runtime.

• Examples of un...read more

The probability of finding a blue colored ball on the second draw from a bag with half red and half blue balls.

• The probability of drawing a blue ball on the first draw is 1/2 since the bag is half filled with blue balls.

• After the first draw, there will be one less blue ball and one less total ball in the bag, affecting the probability for the second draw.

• The probability of drawing a blue ball on the second draw can be calculated using conditional probability.

Yes, we can use super and this in a single constructor.

• Using 'super' in a constructor calls the parent class constructor.

• Using 'this' in a constructor calls another constructor in the same class.

• We can use both 'super' and 'this' in the same constructor to call both parent and same class constructors.

• Example: public MyClass(int x) { this(x, 0); super(); }

Yes, protected members are inherited in subclasses in hierarchy.

• Protected members are accessible within the class and its subclasses.

• They are not accessible outside the class hierarchy.

• Subclasses can access protected members of their parent class.

• Example: class A has a protected member x, class B extends A can access x.

• Example: class C extends B can also access x.

The super class of Exception is Throwable.

• Throwable is the root class of all exceptions in Java.

• It has two direct subclasses: Exception and Error.

• Exceptions are used for recoverable errors while Errors are used for unrecoverable errors.

• All exceptions and errors inherit from Throwable.

• Throwable provides methods like getMessage() and printStackTrace() to handle exceptions.

Data structures are essential for efficient storage and retrieval of data.

• Data structures allow for faster access and manipulation of data.

• They help in organizing and managing large amounts of data.

• Examples include arrays, linked lists, trees, and graphs.

• Without data structures, algorithms would be less efficient and more complex.

• Data structures are used in various fields such as computer science, finance, and engineering.

Containers in Docker can communicate through networking using bridge networks, overlay networks, or user-defined networks.

• Containers can communicate with each other using IP addresses and port numbers.

• Docker provides default bridge networks for communication between containers on the same host.

• Overlay networks allow communication between containers across multiple hosts.

• User-defined networks can be created for custom communication requirements.

• Containers can also communicate ...read more

Create a calculator function that prints the next element in sequence each time it is called.

• Create a function that keeps track of the current number in the sequence

• Each time the function is called, calculate the next number in the sequence based on the previous number

• Print the next number in the sequence each time the function is called

Pipeline process in Jenkins automates the software delivery process.

• Pipeline is defined as code in a Jenkinsfile

• It consists of stages, steps, and post actions

• Each stage can have multiple steps like build, test, deploy

• Pipeline can be triggered manually or automatically based on events

Polymorphism is the ability of a function or method to behave differently based on the object it is called on.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to be used for different data types or classes.

• Examples include method overloading and method overriding in object-oriented programming languages like Java.

Implementing SCD type2 in Spark code

• Use DataFrame operations to handle SCD type2 changes

• Create a new column to track historical changes

• Use window functions to identify the latest record for each key

• Update existing records with end dates and insert new records with start dates

Migration process of Github to Azure Repos involves exporting repositories from Github and importing them into Azure Repos.

• Export repositories from Github using tools like Git or Github API

• Prepare repositories for migration by cleaning up and resolving any dependencies

• Import repositories into Azure Repos using tools like Azure DevOps Services or Git commands

• Update any references or configurations to point to the new Azure Repos location

• Test the migrated repositories to ensure...read more

Use CSS selectors to target parent element based on child element

• Use the child element's class or ID to target the parent element

• Use the > combinator to select a parent element based on a direct child element

• Use the ~ combinator to select a parent element based on a sibling element

Create a context in React to change language on button click

• Create a context using createContext() method

• Provide a state for language and a function to change it

• Wrap the components that need access to language context with Context.Provider

• Use useContext hook to access language context in components

• Update language state on button click

React is a JavaScript library for building user interfaces. It is different from Angular and Vue in terms of architecture, data binding, and learning curve.

• React is a library, while Angular and Vue are frameworks.

• React uses a virtual DOM for better performance, while Angular and Vue use a real DOM.

• React follows a unidirectional data flow, while Angular and Vue use bidirectional data binding.

• React has a smaller learning curve compared to Angular, which has a steeper learning c...read more

Yes, I have experience writing tests in React using Jest.

• I have experience writing unit tests for React components using Jest.

• I am familiar with testing libraries like Enzyme for React component testing.

• I understand how to write snapshot tests to ensure UI consistency in React applications.

Redux is a predictable state container for JavaScript apps. It helps manage the state of an application in a single immutable state tree.

• Redux stores the entire state of an application in a single immutable state tree.

• The state tree is read-only, and changes are made by dispatching actions.

• Reducers specify how the state changes in response to actions.

• The store holds the state tree, allows access to state via getState(), and allows state to be updated via dispatch(action).

• Midd...read more

Program to find min and max no from array of strings

• Iterate through the array and compare each element to find min and max

• Use Integer.parseInt() to convert strings to integers for comparison

• Initialize min and max variables with first element of array

I manage state using React's useState hook and context API for global state management.

• Using React's useState hook to manage local component state

• Utilizing React's context API for global state management

• Implementing Redux for complex state management scenarios

A programme to check if a given string is a palindrome.

• Create a function that takes a string as input.

• Convert the string to lowercase and remove any non-alphanumeric characters.

• Reverse the string and compare it to the original string.

• If they are the same, return true. Otherwise, return false.

The @Controller annotation is used to create a controller class in Spring MVC, while @RestController is used to create RESTful web services.

• The @Controller annotation is used to create a controller class in Spring MVC, which is used to handle traditional web requests.

• The @RestController annotation is used to create RESTful web services, which return data in JSON or XML format.

• The @RestController annotation is a specialized version of the @Controller annotation that includes t...read more

Cache stores data temporarily for faster access, while persist saves data permanently.

• Cache is temporary storage used to store frequently accessed data for faster retrieval.

• Persist saves data permanently, typically to a disk or database.

• Cache is often used in web applications to store frequently accessed data like images or scripts.

• Persist is commonly used to store user data or application settings that need to be retained even after the application is closed.

Snapshot in Maven is a version of a project that is still in development and not yet released.

• Snapshots are versions of a project that are still in development and not yet released.

• They are identified by the suffix '-SNAPSHOT' in the version number.

• Snapshots can be deployed to a Maven repository for sharing with other developers for testing purposes.

• They are not intended for production use as they are subject to frequent changes.

Yes, I have worked on various data structures like arrays, linked lists, stacks, queues, trees, and graphs.

• I have implemented algorithms using data structures like sorting, searching, and traversal.

• I have optimized code by choosing the appropriate data structure for the problem.

• I have used data structures in projects to efficiently store and manipulate data.

Yes, I have experience working on Multithreading in Java.

• Implemented multithreading using Java's Thread class

• Used synchronized keyword to handle thread synchronization

• Utilized Executor framework for managing thread pools

String Buffer and String Builder are classes in Java used for manipulating strings.

• String Buffer and String Builder are mutable classes, meaning they can be modified.

• String Buffer is synchronized, making it thread-safe but slower than String Builder.

• String Builder is not synchronized, making it faster but not thread-safe.

• Both classes have methods for appending, inserting, deleting, and replacing characters in a string.

• Example: StringBuilder sb = new StringBuilder("Hello"); sb...read more

Verification ensures the product is built right, while validation ensures the right product is built.

• Verification focuses on whether the software meets the specified requirements.

• Validation focuses on whether the software meets the customer's needs and expectations.

• Verification is done through reviews, inspections, walkthroughs, and static analysis.

• Validation is done through testing, user feedback, and acceptance criteria.

• Example: Verification would involve checking if a logi...read more

Functional testing focuses on the behavior of the system, while non-functional testing focuses on performance, security, and usability.

• Functional testing checks if the system functions as expected based on requirements.

• Non-functional testing evaluates aspects like performance, security, and usability.

• Examples of functional testing include unit testing, integration testing, and system testing.

• Examples of non-functional testing include load testing, security testing, and usabil...read more

OOPS concepts are the principles of Object-Oriented Programming that help in designing and implementing software solutions.

• Encapsulation - bundling of data and methods that operate on that data

• Inheritance - ability of a class to inherit properties and methods from a parent class

• Polymorphism - ability of objects to take on multiple forms or behaviors

• Abstraction - hiding of complex implementation details and providing a simplified interface

The @Service annotation is used to mark a class as a service, while the @Repository annotation is used to mark a class as a repository.

• The @Service annotation is typically used on service layer classes, which contain business logic.

• The @Repository annotation is typically used on repository classes, which interact with a database or other data source.

• Both annotations are used for component scanning and dependency injection in Spring framework.

• Example: @Service UserService { .....read more

ArrayList is implemented using a dynamic array while LinkedList is implemented using a doubly linked list.

• ArrayList provides fast access to elements using index, but slow insertion and deletion.

• LinkedList provides fast insertion and deletion, but slow access to elements.

• Example: ArrayList is suitable for scenarios where random access is required, while LinkedList is suitable for scenarios where frequent insertion and deletion are needed.

super and this are used in object-oriented programming to refer to the parent class and current instance respectively.

• super is used to call a method or constructor from the parent class

• this is used to refer to the current instance of the class

• super() must be the first statement in a constructor

• this() can be used to call another constructor in the same class

Address toxic work culture by open communication, setting boundaries, seeking support, and considering leaving if necessary.

• Open communication with colleagues and management about issues

• Set boundaries to protect your mental and emotional well-being

• Seek support from HR, a mentor, or a therapist if needed

• Consider leaving the toxic work environment if the situation does not improve

Use CSS to create a triangle shape

• Use border properties to create a triangle shape

• Set the width and height of the element to 0

• Use borders of different colors to create the triangle shape

The question is about bond and location.

• Discuss the concept of bond and its importance in software development

• Explain the significance of location in software development

• Provide examples of how bond and location can impact software development projects

EMD ticketing refers to Electronic Miscellaneous Document used for ancillary services in airline industry.

• EMD transactions are used for services like excess baggage, lounge access, seat upgrades, etc.

• There are different types of EMD transactions such as EMD-A, EMD-S, EMD-T, EMD-E, etc.

• EMD-A is used for additional services, EMD-S for seat selection, EMD-T for excess baggage, and EMD-E for upgrades.

• EMD transactions are stored electronically and can be linked to the passenger's ...read more

Risk based testing is a method of prioritizing testing efforts based on the likelihood and impact of potential failures.

• Identify potential risks and their impact on the system

• Prioritize testing efforts based on the identified risks

• Allocate resources accordingly to mitigate the identified risks

• Continuously monitor and reassess risks throughout the testing process

Object Oriented Programming is a programming paradigm that focuses on objects and their interactions.

• OOP is based on the concept of classes and objects

• It emphasizes encapsulation, inheritance, and polymorphism

• Examples of OOP languages include Java, C++, and Python

The question is unclear and does not make sense.

A materialized view is a database object that contains the results of a query and is stored as a table for faster access.

• Materialized views store the results of a query and can be refreshed periodically.

• They are used to improve query performance by pre-computing and storing the results.

• Materialized views are especially useful for complex queries that involve aggregations or joins.

• They can be refreshed manually or automatically based on a schedule or trigger.

• Example: Creating ...read more

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 follows the OOPS concepts like inheritance, polymorphism, encapsulation, and abstraction

• Java programs are compiled into bytecode and run on the Java Virtual Machine (JVM)

• Java has a vast library of pre-built classes and APIs for various functionalities

• Java is widely used for developing web applications, mobi...read more

Troubleshooting and debugging involves identifying and resolving issues in software or systems.

• Identify the problem by gathering information and reproducing the issue

• Use debugging tools like logs, breakpoints, and profilers to pinpoint the issue

• Isolate the root cause of the problem and develop a plan to fix it

• Implement the solution and test to ensure the issue is resolved

• Document the troubleshooting process and solution for future reference

EDIFACT messages are standardized messages used in ticketing transactions.

• EDIFACT messages are used in the travel industry for exchanging ticketing information.

• They follow a specific format defined by the EDIFACT standard.

• Examples of EDIFACT messages for ticketing transactions include TKT (ticketing) and TKU (ticketing update).

I am open to negotiation based on the company's policies and industry standards.

• I am looking for a fair compensation package that aligns with my skills and experience.

• I have researched the industry standards and the company's policies to have a realistic expectation.

• I am open to discussing the salary and benefits package during the interview process.

• I am more interested in gaining valuable experience and learning opportunities than just the salary.

Airline messages TTY for passive segment

• TTY (Teletypewriter) messages are used for communication with passengers who are deaf or hard of hearing

• Passive segment refers to a portion of a flight where passengers are not actively engaged in activities like eating or watching a movie

• Airline messages sent via TTY for passive segment may include updates on flight status, safety information, and entertainment options

Redux Thunk is a middleware that allows asynchronous actions to be dispatched in Redux.

• Redux Thunk is a middleware that extends the Redux store's abilities.

• It allows actions to return functions instead of plain objects.

• These functions can perform asynchronous operations and dispatch actions when needed.

• Thunk functions have access to the store's dispatch and getState methods.

• Example: dispatching an asynchronous action to fetch data from an API.

My framework is a hybrid framework that combines data-driven and keyword-driven approaches.

• The framework uses Excel sheets to store test data and test cases.

• It also uses keywords to perform actions and validations.

• The framework is modular and can be easily extended.

• It supports both manual and automated testing.

• The framework provides detailed reports and logs for easy debugging.

The process of selecting a framework involves evaluating requirements, researching available options, conducting proof of concepts, and considering factors like scalability, maintainability, and community support.

• Understand project requirements and constraints

• Research available automation frameworks

• Conduct proof of concepts to evaluate framework suitability

• Consider factors like scalability, maintainability, and community support

• Select a framework that best fits the project ne...read more

ConcurrentHashMap is a thread-safe implementation of the Map interface in Java.

• ConcurrentHashMap allows multiple threads to access and modify the map concurrently.

• It achieves thread-safety by dividing the map into segments, allowing concurrent access to different segments.

• Each segment acts as an independent hash table, reducing contention between threads.

• ConcurrentHashMap provides atomic operations like putIfAbsent(), replace(), etc.

• Example: ConcurrentHashMap map = new Concur...read more

Business ethics are principles and values that guide the behavior of individuals and organizations in the business world.

• Business ethics involve honesty, integrity, fairness, and respect for others.

• They also include social responsibility, sustainability, and compliance with laws and regulations.

• Examples of ethical dilemmas in business include conflicts of interest, bribery, and discrimination.

• Adhering to ethical principles can enhance a company's reputation and build trust wi...read more

Agile methodology is an iterative approach to software development that emphasizes flexibility and collaboration.

• Agile values individuals and interactions over processes and tools

• It emphasizes working software over comprehensive documentation

• Agile teams work in short iterations called sprints

• The team continuously delivers working software to the customer

• Agile encourages frequent communication and collaboration between team members and stakeholders

Api integration in React involves fetching data from external APIs and displaying it in the application.

• Use fetch or axios to make API calls in React components

• Handle API responses using promises or async/await

• Update component state with fetched data to render it on the UI

To delete duplicated rows in a table, use the DISTINCT keyword in a SELECT statement.

• Use the SELECT DISTINCT statement to retrieve unique rows.

• Use the DELETE statement with a subquery to delete duplicate rows.

• Use the ROW_NUMBER() function to identify and delete duplicate rows.

• Use the GROUP BY clause to group rows by a specific column and delete duplicates.

• Use the CTE (Common Table Expression) to delete duplicate rows.

Peer review is a process where work is evaluated by others in the same field for quality and accuracy.

• Peer review involves experts in the same field evaluating the work of their peers

• It helps ensure the quality and accuracy of the work being reviewed

• Feedback from peer review can help improve the overall quality of the work

• Common in academic research, scientific publications, and software development

Metrics calculation for team

• Identify key performance indicators (KPIs) to measure team performance

• Collect relevant data to calculate the metrics

• Define formulas or methods to calculate each metric

• Analyze the metrics to identify trends, patterns, and areas for improvement

• Present the metrics in a clear and concise manner to stakeholders

Writing code for Java programs

• Use proper syntax and conventions in Java programming

• Understand the problem statement clearly before writing the code

• Test the code thoroughly before finalizing it

String is a sequence of characters in Java, stored as an array of Unicode characters.

• Strings are immutable in Java, meaning their values cannot be changed once created.

• String objects can be created using string literals or the new keyword.

• String class provides various methods for manipulating strings, such as substring(), length(), etc.

• String concatenation can be done using the + operator or the concat() method.

• String comparison can be done using the equals() method or the co...read more

GCP Dataflow is a fully managed service for processing and analyzing streaming and batch data.

• GCP Dataflow allows for parallel processing of data in real-time or batch mode

• It automatically optimizes and scales the processing resources based on the workload

• Dataflow pipelines can be written in Java, Python, or Apache Beam SDK

• It integrates with other GCP services like BigQuery, Pub/Sub, and Datastore

OOPS concept of Java refers to Object-Oriented Programming principles like inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the implementation details and showing only the necessary features to the outside w...read more

Diffing algorithm is used to compare two sets of data and identify the differences between them.

• Diffing algorithms are commonly used in version control systems to track changes in code.

• They compare two sets of data and identify additions, deletions, and modifications.

• Examples of diffing algorithms include Myers' diff algorithm and the patience diff algorithm.