Verizon Sde1 Interview Questions and Answers

Q1. Find nth elements from last in linked list
Ans. 
Use two pointers to find the nth element from the end of a linked list.
• Use two pointers, one moving n steps ahead of the other

• When the first pointer reaches the end, the second pointer will be at the nth element from the end
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Q2. Difference between hashmap and concurrent hashmap
Ans. 
HashMap is not thread-safe while ConcurrentHashMap is thread-safe and allows concurrent access.
• HashMap is not thread-safe and can lead to ConcurrentModificationException if accessed by multiple threads simultaneously.

• ConcurrentHashMap allows concurrent access by multiple threads without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, allowing multiple th...read more
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Q1. Amazon: Add Cart feature - Write Selenium code
Ans. 
Use Selenium to automate adding items to cart on Amazon website.
• Locate the 'Add to Cart' button on the product page using Selenium's findElement method

• Click on the 'Add to Cart' button to add the item to the cart

• Verify that the item has been successfully added to the cart by checking the cart contents
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Q2. Test cases of Login API
Ans. 
Test cases for Login API
• Verify valid username and password login successfully

• Verify invalid username and password combination fails to login

• Verify login with empty username or password fails

• Verify login with special characters in username or password fails
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Q3. Write a program to count the character in a string
Ans. 
A program to count the characters in a string
• Iterate through each character in the string and increment the count for each character

• Use a hashmap to store the count of each character

• Handle edge cases like empty string or null input
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Q4. UI test cases of Upload document
Ans. 
UI test cases for uploading a document
• Verify that the 'Upload' button is functional

• Check if the correct file types are allowed for upload

• Ensure that the progress bar is displayed during upload

• Confirm that the document is successfully uploaded and visible on the UI
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Q5. UI test cases of a Form
Ans. 
UI test cases for a Form
• Verify all required fields are displayed

• Test validation messages for invalid inputs

• Check if form submission is successful

• Test the functionality of reset button
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Q6. How to achieve parallel execution of test cases in testNG?
Ans. 
Parallel execution of test cases in TestNG can be achieved using TestNG's parallel attribute in the testng.xml file.
• Set the 'parallel' attribute in the testng.xml file to 'methods', 'classes', or 'tests' to specify the level of parallelism.

• Use the 'thread-count' attribute to specify the number of threads to be used for parallel execution.

• Ensure that the test classes are thread-safe to avoid any conflicts during paralle
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Q7. Write a program to reverse the words in a string I/P: My name is abc O/P: abc is name My
Ans. 
Program to reverse words in a string
• Split the input string into an array of words

• Reverse the array of words

• Join the reversed array back into a string
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Q1. Write a program to reverse the string. I/P: I LOVE JAVA O/P: A VAJE VOLI
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Q2. Regression vs Sanity
Ans. 
Regression testing ensures existing functionality still works after changes, while sanity testing checks if new functionality works as expected.
• Regression testing is performed to make sure that new code changes do not adversely affect existing functionality.

• Sanity testing is a cursory testing to make sure that the new functionality is working as expected.

• Regression testing is usually automated and covers a wide range o...read more
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Q3. Explain automation framework
Ans. 
Automation framework is a set of guidelines, tools, and processes used to automate testing of software applications.
• Automation framework provides structure and guidelines for creating and executing automated tests.

• It helps in organizing test scripts, managing test data, and generating test reports.

• Examples of automation frameworks include Selenium, TestNG, and Cucumber.

• Frameworks can be data-driven, keyword-driven, or
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Q4. What are the reasons for 500 - Internal Server Error
Ans. 
500 Internal Server Error is a generic error message indicating a problem with the server.
• Server misconfiguration

• Server overload

• Programming errors in server-side code

• Database connection issues

• Insufficient server resources
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Q5. Submit button -> Click -> Blank page Identify the debug and find the root cause
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Q6. Write test cases of an API that creates User's profile by accepting First name, Last name and mobile number
Ans. 
Test cases for API creating User's profile with First name, Last name, and mobile number
• Verify that a user profile is created successfully with valid First name, Last name, and mobile number

• Test with invalid First name (empty, special characters, numbers)

• Test with invalid Last name (empty, special characters, numbers)

• Test with invalid mobile number (empty, alphabets, special characters, less than 10 digits)

• Verify that ...read more
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Q1. Tell me about your past experience?
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Q1. Technical Interview + Coding
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Q1. Technical Interview
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They will give 3 questions

Q1. There will be technical round after finishing of exam
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Q2. And HR round also will be same time of Technical
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Q1. Questions on ReactJS and code snippets
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It was a machine coding round

Q1. Mostly Scenario based
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Q2. 1 coding quest, then Detail discussion on each and every topic
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Dsa dp, graphs and many more questions from arrays and linked list were asked