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I was interviewed in Jan 2025.
(15 Questions)
- Q1. Explain the difference between ArrayList and LinkedList in Java. ArrayList is implemented as a dynamic array, while LinkedList is a doubly linked list. ArrayList provides fast random access (O(1) complexit...
- Ans.
ArrayList is preferred for frequent retrieval operations due to fast random access, while LinkedList is suitable for frequent insertions/deletions.
Use ArrayList when frequent retrieval operations are required, such as searching for elements in a large collection.
Choose LinkedList when frequent insertions/deletions are needed, like maintaining a queue or stack.
Consider memory overhead and performance trade-offs when dec...
- Q2. What are the advantages and disadvantages of using Java’s synchronized keyword for thread synchronization? The synchronized keyword ensures that only one thread can access a block of code at a time. It pre...
- Ans.
ReentrantLock should be used instead of synchronized when more flexibility and control over locking mechanisms is needed.
Use ReentrantLock when you need to implement custom locking strategies or require advanced features like tryLock() and lockInterruptibly().
ReentrantLock supports fair locking mechanisms, ensuring that threads acquire the lock in the order they requested it.
Explicit unlocking in ReentrantLock reduces ...
- Q3. What is the difference between == and .equals() in Java? == checks for reference equality, meaning it compares memory addresses. equals() checks for value equality, which can be overridden in user-defined ...
- Ans.
In Java, == checks for reference equality while equals() checks for value equality. Misuse of == can lead to logical errors.
Override equals() when you want to compare the values of objects instead of their references
Override hashCode() alongside equals() to ensure proper functioning in collections like HashMap
Consider implementing Comparable interface for natural ordering in collections
- Q4. How does the Java garbage collector work? Garbage collection in Java automatically reclaims memory occupied by unused objects. The JVM has different types of GC algorithms, including Serial, Parallel, CMS,...
- Ans.
Garbage collection in Java automatically reclaims memory occupied by unused objects using different algorithms and memory regions.
Java garbage collector automatically reclaims memory from unused objects
Different types of GC algorithms in JVM: Serial, Parallel, CMS, G1 GC
Objects managed in Young Generation, Old Generation, and PermGen/Metaspace
Minor GC cleans up short-lived objects in Young Generation
Major GC (Full GC) ...
- Q5. What are the main features of Java 8? Java 8 introduced lambda expressions, enabling functional-style programming. The Stream API allows efficient data processing with map, filter, and reduce operations. D...
- Ans.
Lambda expressions in Java 8 improve readability and maintainability by enabling concise and functional-style programming.
Lambda expressions allow writing more compact code by reducing boilerplate code.
They enable passing behavior as arguments to methods, making code more modular and flexible.
Example: (a, b) -> a + b is a lambda expression that adds two numbers.
- Q6. Describe the differences between checked and unchecked exceptions in Java. Checked exceptions must be handled using try-catch or declared with throws. Unchecked exceptions (RuntimeException and its subclas...
- Ans.
Checked exceptions must be handled explicitly, while unchecked exceptions do not require explicit handling.
Use custom exceptions when you want to create your own exception types to handle specific scenarios.
Custom exceptions can be either checked or unchecked, depending on whether you want to enforce handling or not.
For example, a custom InvalidInputException could be a checked exception if you want to ensure it is cau...
- Q7. What is the Java Memory Model, and how does it affect multithreading and synchronization? The Java Memory Model (JMM) defines how threads interact with shared memory. It ensures visibility and ordering of ...
- Ans.
The Java Memory Model defines how threads interact with shared memory, ensuring visibility and ordering of variable updates in a concurrent environment.
Volatile keyword ensures changes to a variable are always visible to all threads.
Synchronized keyword provides mutual exclusion and visibility guarantees.
Reordering optimizations by the compiler or CPU can lead to unexpected behavior.
Happens-before relationship determin...
- Q8. Can you explain the difference between method overloading and method overriding in Java? Method overloading allows multiple methods with the same name but different parameters. It occurs within the same cl...
- Ans.
Method overloading allows multiple methods with the same name but different parameters, while method overriding allows a subclass to provide a different implementation of a parent method.
Use method overloading when you want to provide multiple ways to call a method with different parameters.
Use method overriding when you want to provide a specific implementation of a method in a subclass.
Example of method overloading: ...
- Q9. What are functional interfaces in Java, and how do they work with lambda expressions? A functional interface is an interface with exactly one abstract method. Examples include Runnable, Callable, Predicate...
- Ans.
Functional interfaces in Java have exactly one abstract method and work with lambda expressions for concise implementation.
Functional interfaces have exactly one abstract method, such as Runnable, Callable, Predicate, and Function.
Lambda expressions provide a concise way to implement functional interfaces.
Default methods in interfaces help in evolving APIs without breaking backward compatibility.
Method references (::) ...
- Q10. What is a Java Stream, and how does it differ from an Iterator? Streams enable functional-style operations on collections with lazy evaluation. Unlike Iterators, Streams support declarative operations lik...
- Ans.
Java Streams enable functional-style operations on collections with lazy evaluation, unlike Iterators.
Parallel streams can improve performance by utilizing multiple threads, but may introduce overhead due to thread management.
Care must be taken to ensure thread safety when using parallel streams in a multi-threaded environment.
Parallel streams are suitable for operations that can be easily parallelized, such as map and...
- Q11. Explain the concept of immutability in Java and its advantages. An immutable object cannot be changed after it is created. The String class is immutable, meaning modifications create new objects. Immutabl...
- Ans.
Immutability in Java prevents objects from being changed after creation, promoting thread safety and preventing unintended side effects.
Immutable objects cannot be modified after creation, promoting thread safety
String class in Java is immutable, modifications create new objects
Use final fields and avoid setters to create immutable classes
Collections can be made immutable using Collections.unmodifiableList()
Immutabilit...
- Q12. What is the difference between final, finally, and finalize in Java? final is a keyword used to declare constants, prevent method overriding, or inheritance. finally is a block that executes after a try-c...
- Ans.
final, finally, and finalize have different meanings in Java. final is for constants, finally for cleanup, and finalize for garbage collection.
final is used for constants, preventing method overriding, and inheritance
finally is used for cleanup actions after a try-catch block
finalize() is called by the garbage collector before object deletion
Alternatives to finalize() for resource management include using try-with-reso...
- Q13. Explain the Singleton design pattern in Java. Singleton ensures that only one instance of a class exists in the JVM. It is useful for managing shared resources like database connections. A simple implemen...
- Ans.
Singleton design pattern ensures only one instance of a class exists in the JVM, useful for managing shared resources like database connections.
Avoid using Singleton when multiple instances of a class are required.
Avoid Singleton for classes that are not thread-safe.
Avoid Singleton for classes that need to be easily mockable for testing purposes.
- Q14. What are Java annotations, and how are they used in frameworks like Spring? Annotations provide metadata to classes, methods, and fields. @Override, @Deprecated, and @SuppressWarnings are common built-in ...
- Ans.
Java annotations provide metadata to classes, methods, and fields, improving code readability and maintainability.
Annotations like @Component, @Service, and @Autowired in Spring help with dependency injection
Annotations reduce boilerplate code compared to XML configurations
Custom annotations can be created using @interface
Reflection APIs allow reading annotation metadata dynamically
Annotations like @Transactional simpl
- Q15. How do Java Streams handle parallel processing, and what are its pitfalls? Parallel streams divide data into multiple threads for faster processing. The ForkJoin framework handles parallel execution inter...
- Ans.
Java Streams handle parallel processing by dividing data into multiple threads using the ForkJoin framework. Pitfalls include race conditions, performance issues with small datasets, and debugging challenges.
Parallel streams divide data into multiple threads for faster processing
ForkJoin framework handles parallel execution internally
Useful for CPU-intensive tasks but may not improve performance for small datasets
Share...
I was interviewed in Jan 2025.
A sequence was provided: 4181, 2684, 1597, 987, 610.
first 2 are given and write code for other value calculation using java 8
The second question required writing a reverse of a palindrome using both Java 8 streams. I was able to successfully write both and clear the first round.
(6 Questions)
- Q1. Interviewer was himself not knowing anything as it was walkin drive he was sitting infront of me and checking questions on phone Introduction that he inturrepted in between when I was introducing myself
- Q2. What are the features of Java 17, specifically related to sealed classes, including their syntax and necessity, along with the potential errors encountered when invoking a sealed class?
- Ans.
Java 17 introduces sealed classes to restrict inheritance and improve code maintainability.
Sealed classes are declared using the 'sealed' keyword followed by the permitted subclasses.
Subclasses of a sealed class must be either final or sealed themselves.
Errors may occur when trying to extend a sealed class with a non-permitted subclass.
- Q3. Java 8 feathers stream api, functional interface, Intermittent operator ,Ternary operator, Prediction,Bi predicate. Answered all successfully
- Q4. Draw low level design of implementation of notify me if item is back in stock in a ecommerce application
- Ans.
Implementation of 'notify me if item is back in stock' feature in an ecommerce application
Create a database table to store user notifications for out-of-stock items
Implement a service to check item availability and send notifications to subscribed users
Provide a user interface for users to subscribe to notifications for specific items
- Q5. All design patterns which I know. Asked me to implement adapter pattern on paper
- Q6. Then given a problem that concurrent way perform operation on excell to decrease the response time
Interview Preparation Tips
Selected
(2 Questions)
- Q1. Asking introduction and tools
- Q2. Asking command and down Time
Interview Preparation Tips
1. Optimize Your Resume & Cover Letter
Tailor your resume to each job by highlighting relevant skills and experience.
Use keywords from the job description to pass Applicant Tracking Systems (ATS).
Keep it concise (1-2 pages) and error-free.
Your cover letter should tell a compelling story about why you're a great fit.
2. Build & Leverage Your Network
Let friends, family, and former colleagues know you're job hunting.
Use LinkedIn to connect with professionals in your industry.
Attend networking events, career fairs, and industry meetups.
3. Use Multiple Job Search Strategies
Apply on company websites, job boards (LinkedIn, Indeed, Glassdoor), and recruitment agencies.
Reach out to hiring managers directly via LinkedIn or email.
Consider internships, freelance work, or contract jobs to gain experience.
4. Prepare for Interviews
Research the company and role thoroughly.
Practice common interview questions and prepare examples of your achievements.
Dress professionally and arrive early.
Follow up with a thank-you email after the interview.
5. Upskill & Stay Competitive
Take online courses or certifications relevant to your field.
Stay updated on industry trends.
Work on side projects or volunteer work to showcase your skills.
6. Stay Organized & Persistent
Track applications and follow up if you don’t hear back in a reasonable time.
Rejection is part of the process—keep applying and improving.
Set daily/weekly goals for job applications and networking.
Would you like help with a specific job search situation?
Selected
I was interviewed in Aug 2024.
(6 Questions)
- Q1. Linux commands like Cat /etc/os-release
- Q2. Aws services like NAT, NACL etc
- Q3. Service Assurance
- Q4. Monitoring and observability
- Q5. Devops principles
- Q6. Major Incident lifecycle
Interview Preparation Tips
I was interviewed in Jan 2025.
Numerical reasoning : Tests mathematical skills,such as number sequences,percentages,and ratios.
(6 Questions)
- Q1. What is the difference between static and dynamic typing in python?
- Q2. What is the difference between list and touple in python?
- Q3. Data structures and algorithms
- Q4. Object oriented programming
- Q5. File handling and database
- Q6. Advanced python topics
Gd Topics:
1.Current affairs
2.Business and Economy
3.Social and Cultural
(6 Questions)
- Q1. CN you tell me about your self?
- Q2. Why do you want to work as a python developer?
- Q3. Career goals and motivation
- Q4. Team work and communication
- Q5. Problem solving and adaptability
- Q6. Behavioral questions
Interview Preparation Tips
2.practice interview skills
3.Follow the interview tips
Selected
I applied via campus placement at National Institute of Technology (NIT), Kurukshetra and was interviewed in Dec 2024. There were 2 interview rounds.
(6 Questions)
- Q1. Introduce yourself
- Q2. How will you handle disputes in the team?
- Q3. Explain your projects
- Q4. Why you want to work as Manager although your degree is in Electrical Engineering
- Q5. Which operation do you think are costly in the Delhivery Last mile, First mile, Middle , Transportation etc ?
- Q6. What you have managed in College?
(6 Questions)
- Q1. Introduce yourself
- Q2. Explain your projects
- Q3. Why you want to join Delhivery as a Manager although you are from Electrical Engineering department?
- Q4. How will you unload vehicles? What factors will you consider while unloading?
- Q5. Suppose you are managing a team of 20 people and 10 are absent what actions will you take ?
- Q6. Any Questions you want to ask
Interview Preparation Tips
- Management
- Supply chain management
- Situation based questions
- Logistics Management
- Warehouse Management
Explain situation based questions strategically with logics.
Prepare for Supply chain management and logistics basics they might ask.
Be confident and pray to God.
Selected
(4 Questions)
- Q1. Good communication with our team and my colleagues
- Q2. Need improve my skills and strictly fallow up our EHS values
- Q3. Target is more important in your life, keep doing work unless get your unreachable targets.
- Q4. Good behaviour build your team and save ethics.
Interview Preparation Tips
Graduate Engineer Trainee (Get) Interview Questions & Answers
Ericsson
Anonymous
posted on 12 Dec 2024
I applied via Campus Placement and was interviewed in Nov 2024. There were 4 interview rounds.
English, Quant & Reasoning- 3 section, each section 15 que, Total 45 minutes & 45 questions, cut off for each section
(2 Questions)
- Q1. Java What is JVM,JRE,JDK? what is the difference between class and instance variable in java? what is string Pool? write a code in java(prefer a good standard question) Web development if you have inter...
- Ans.
To build a web application, I would use a combination of front-end technologies like HTML, CSS, and JavaScript, along with back-end technologies like Node.js and MongoDB.
Use HTML for structuring the content of the web pages
Use CSS for styling the web pages and making them visually appealing
Use JavaScript for adding interactivity to the web pages and handling user input
Use Node.js for server-side scripting and handling ...
- Q2. If you have azure certification what is azure, what is Azure Blob Storage, What is ARM, what is horizontal Scaling?
- Ans.
Azure is a cloud computing platform by Microsoft. Azure Blob Storage is a service for storing large amounts of unstructured data. ARM stands for Azure Resource Manager, used for managing resources in Azure. Horizontal scaling is increasing the number of instances of a service to distribute load.
Azure is a cloud computing platform by Microsoft
Azure Blob Storage is a service for storing large amounts of unstructured data
...
(2 Questions)
- Q1. Why cse? explain a project (they might ask about a project in your resume)
- Q2. How you solved the problems that you have faced while working on projects?
- Ans.
I approach problems by breaking them down into smaller parts, analyzing root causes, seeking input from team members, and implementing solutions systematically.
Identify the root cause of the problem
Break down the problem into smaller parts
Seek input from team members for different perspectives
Implement solutions systematically
Learn from the experience to prevent similar issues in the future
(1 Question)
- Q1. Introduction Family Background Do you have any placement/internship offers in your hand? if so, why Ericsson At last, they will tell you about stipend, role
- Ans.
Yes, I have internship offers from Ericsson due to their reputation for innovation and cutting-edge technology.
I have received internship offers from Ericsson because of their reputation for innovation and cutting-edge technology.
I am excited about the opportunity to work with a global leader in telecommunications.
I believe that interning at Ericsson will provide me with valuable experience and skills that will benefit
Interview Preparation Tips
As it is a networking company, concentrate on computer networks(they might ask / might not)
Qa Automation Testing Engineer Interview Questions & Answers
Nagarro
Anonymous
posted on 30 Jan 2025
I was interviewed in Dec 2024.
Basic quant and reasoning questions
Selenium MCQ
Java programs with MCQ
(23 Questions)
- Q1. Tell me about yourself
- Q2. Where you initialise driver
- Ans.
The driver is typically initialized in the setup method of a test automation framework.
Driver initialization is usually done in a setup method before test execution.
Commonly used methods for driver initialization include WebDriverManager, System.setProperty, and driver instantiation.
Example: WebDriverManager.chromedriver().setup();
- Q3. Driver is static or non static
- Ans.
Driver can be both static and non-static depending on the context of its usage.
Driver class can be static if it is used to initiate the WebDriver instance in a test automation framework.
Driver class can be non-static if it is used as an instance variable within a test class.
Static driver can be accessed directly without creating an object of the class.
Non-static driver requires an object of the class to be created befo
- Q4. Difference between static and non static
- Ans.
Static variables belong to the class itself, while non-static variables belong to instances of the class.
Static variables are shared among all instances of a class
Non-static variables are unique to each instance of a class
Static variables are initialized only once, at the start of the program
Non-static variables are initialized separately for each instance of the class
- Q5. Disadvantages of static and non static
- Ans.
Static and non-static have their own disadvantages in QA automation testing.
Static methods cannot be overridden or inherited, making it difficult to create flexible test cases.
Non-static methods require an instance of the class to be created, which can lead to increased memory usage.
Static methods can lead to tight coupling between classes, making it harder to maintain and update the code.
Non-static methods may have de...
- Q6. Parallel execution in TestNG
- Ans.
TestNG allows parallel execution of test cases to save time and improve efficiency.
TestNG provides the 'parallel' attribute in the testng.xml file to specify the level of parallelism for test execution.
Parallel execution can be achieved at the test level, class level, method level, or suite level.
TestNG also supports parallel execution of tests across multiple classes or suites using the 'parallel' attribute in the sui...
- Q7. Write the code for Parallel testing in TestNG
- Ans.
Parallel testing in TestNG allows running tests concurrently for faster execution.
Use 'parallel' attribute in testng.xml file to specify parallel execution mode.
Set 'parallel' attribute to 'methods', 'classes', or 'tests' based on the level of parallelism needed.
Example: <suite name='MySuite' parallel='tests'>
Use 'thread-count' attribute to specify the number of threads to use for parallel execution.
- Q8. Difference between parallel methods and parallel tests
- Ans.
Parallel methods run multiple methods concurrently within a single test, while parallel tests run multiple tests concurrently.
Parallel methods execute multiple methods within a single test class concurrently.
Parallel tests execute multiple test classes concurrently.
Parallel methods are useful for speeding up the execution of a single test, while parallel tests are useful for running multiple tests faster.
Example: Runni...
- Q9. Upload file using rest assured
- Ans.
Use Rest Assured to upload a file
Use the given file path to create a File object
Use MultiPartSpecBuilder to build the request with the file
Send the request using Rest Assured's given(), when(), and post() methods
- Q10. Postman basic questions
- Q11. Parameter for post method in postman
- Ans.
The parameter for a POST method in Postman is typically sent in the request body.
Parameters are sent in the request body in key-value pairs
Parameters can be sent as form-data, x-www-form-urlencoded, or raw JSON
Example: {"key": "value"}
- Q12. BDD Framework cucumber
- Q13. Cucumber execution process
- Q14. How cucumber know step defination file placed
- Ans.
Cucumber knows the step definition file based on the annotations provided in the feature files.
Cucumber uses annotations like @Given, @When, @Then to map steps in feature files to corresponding step definition methods.
Step definition files are typically placed in a separate package or directory within the project structure.
Cucumber scans the project directory for step definition files based on the package structure and
- Q15. Parameters used in cucumber
- Ans.
Parameters used in cucumber are used to pass values to the step definitions in feature files.
Parameters are defined in feature files using < > syntax
Parameters can be passed to step definitions using Regular Expressions
Parameters can be used to make scenarios more reusable and dynamic
- Q16. Datatable in cucumber
- Ans.
Datatable in Cucumber is used to pass multiple sets of data to a step definition in a scenario.
Datatables are defined using pipes (|) to separate values
Each row in the datatable represents a set of data passed to the step definition
Datatables can be used for parameterization and data-driven testing
- Q17. Have u created the testplan document when porject was started
- Ans.
Yes, I have created the test plan document at the start of the project.
Yes, I always create a test plan document at the beginning of a project to outline the testing approach and strategy.
The test plan document includes details on scope, objectives, resources, schedule, and test cases.
It helps in ensuring that all stakeholders are aligned on the testing process and expectations.
For example, in my previous project, I cr...
- Q18. Testing cycle when project was on initial level
- Ans.
During the initial testing cycle of a project, focus is on establishing test cases, setting up test environments, and identifying potential issues.
Creating test cases based on requirements
Setting up test environments
Identifying potential issues and risks
Executing test cases and reporting defects
Collaborating with developers to resolve issues
- Q19. Risk management and risk based testing
- Q20. Which estimate technique you follow , if fibonacci then why it is in 1 2 3 5 8 13 ?? Not in 12345678
- Ans.
Fibonacci sequence is a mathematical pattern where each number is the sum of the two preceding ones.
Fibonacci sequence is a series of numbers where each number is the sum of the two preceding ones.
The sequence starts with 1, 2, then each subsequent number is the sum of the two previous numbers (1+2=3, 2+3=5, 3+5=8, and so on).
This sequence is used in estimating because it reflects natural growth patterns found in natur
- Q21. What is testing matrix and automation ROI
- Ans.
Testing matrix is a tool used to track test coverage and automation ROI is the return on investment from implementing automation testing.
Testing matrix is a visual representation of test cases, test scenarios, and their coverage across different platforms, browsers, devices, etc.
Automation ROI is the measure of the benefits gained from automation testing compared to the costs incurred in implementing and maintaining th...
- Q22. Cicd tool
- Q23. Handle team ?
Selected
Bachelor of Commerce degree with a GPA of 6.79 and an accompanying resume.
(5 Questions)
- Q1. Location send Hyderabad komplly
- Q2. Hardwark honest project
- Q3. First introducedy
- Q4. Salarypackge and times
- Q5. Respect to office staff
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