NICE Interview Questions and Answers

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Q1. Nice and nice and nice and nice
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Q2. Rjd ke liye message Kiya tha na
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Aptitude test and attribute of the day of the day of the day of

Q1. Write a code to find unique characters in a string / Unique elements in array
Ans. 
This code identifies unique characters in a string or unique elements in an array, ensuring no duplicates are present.
• Use a set to track unique characters: Sets automatically handle duplicates.

• Iterate through the string or array and add elements to the set.

• Convert the set back to a list or string if needed for output.

• Example for string: Input: 'hello', Output: 'helo'.

• Example for array: Input: ['apple', 'banana', 'apple...read more
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Q2. Write a program for Singleton Design Pattern
Ans. 
The Singleton Design Pattern ensures a class has only one instance and provides a global point of access to it.
• Singleton restricts instantiation of a class to one object.

• Useful in scenarios like logging, driver objects, or caching.

• Example in Java: private constructor and a static method to get the instance.

• Thread-safe implementation can be achieved using synchronized methods or double-checked locking.

• Lazy initializatio...read more
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Q3. Service lifetimes of service
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Service lifetimes define how long a service instance is retained in memory during application execution.
• Transient: A new instance is created each time it's requested. Example: A service that generates unique IDs.

• Scoped: A single instance is created per request (or per scope). Example: A database context in a web application.

• Singleton: A single instance is created and shared throughout the application's lifetime. Exampl...read more
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Q4. How to secure your Api if someone is spamming millions of requests on your api
Ans. 
Implement rate limiting, authentication, and monitoring to secure APIs against spam requests.
• Implement Rate Limiting: Use tools like Redis to limit requests per IP, e.g., 100 requests per minute.

• Use API Keys: Require clients to authenticate using API keys to track usage and limit access.

• Implement CAPTCHA: Use CAPTCHA for endpoints that can be abused, like login or registration.

• Monitor Traffic: Use tools like AWS CloudW...read more
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Q5. How to optimize your query
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Optimizing queries involves improving performance and efficiency in database operations to reduce response time and resource usage.
• Use indexing: Create indexes on columns frequently used in WHERE clauses to speed up data retrieval. Example: CREATE INDEX idx_name ON users(name);

• Limit result sets: Use LIMIT to restrict the number of rows returned. Example: SELECT * FROM orders LIMIT 10;

• Avoid SELECT *: Specify only the co...read more
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There is aptitude+DBMS+OS+coding online test round

Q1. OOP-Polymorphism
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Q2. DSA-Mirror image of binary tree
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Mirror image of a binary tree involves swapping the left and right children of each node.
• Start with the root node and recursively swap the left and right children of each node.

• Repeat this process for all nodes in the binary tree.

• The resulting tree will be the mirror image of the original binary tree.
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Q3. SQL query related to joins
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Q4. Discussion on projects and internship experience
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Q1. 1-Java Questions- this, super keyword, Difference between Abstract class and interfece
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Q2. 2-Asked OOPs concepts, asked questions on method overloading and overrding
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Q3. 3-Java program to reverse string, check palindrome
Ans. 
Java program to reverse string and check if it is a palindrome.
• Create a function to reverse the input string.

• Compare the reversed string with the original string to check if it is a palindrome.

• Use built-in functions like StringBuilder or StringBuffer for string manipulation.

• Handle cases where input is null or empty.
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Q4. 4- Selenium questions- list vs set, findelement vs findelements, Actions class, write syntax for actions class, implict wait and explict wait
Ans. 
Selenium questions covering list vs set, findelement vs findelements, Actions class, implicit wait, and explicit wait.
• List vs Set: List allows duplicate elements and maintains insertion order, while Set does not allow duplicates.

• findElement vs findElements: findElement returns the first matching element, findElements returns a list of all matching elements.

• Actions class: Used for performing complex user interactions li...read more
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Q5. 5- Questions on mostly used git commands, what is CICD
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Q6. 6-API testing various response codes
Ans. 
API testing involves checking various response codes to ensure the API functions correctly.
• Test for common response codes like 200 (OK), 400 (Bad Request), 401 (Unauthorized), 404 (Not Found), 500 (Internal Server Error)

• Verify the response code matches the expected result based on the API request

• Use tools like Postman or RestAssured to automate API testing and check response codes

• Check for edge cases where the API may ...read more
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Q7. 7- Manual testing questions- what is regression testing, difference between regression and restesting Difference between intergration and system testing
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Q8. 8- agile process, what is user story, what is sprint
Ans. 
User story is a description of a feature from an end-user perspective, and sprint is a time-boxed iteration in Agile development.
• User story is a short, simple description of a feature told from the perspective of the person who desires the new capability.

• Sprint is a time-boxed iteration in Agile development, usually lasting 1-4 weeks, where a team works on a set of user stories.

• User stories are written in a specific fo...read more
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1st round had aptitude , OS , and software development cycle qns , and then 2 coding questions easy and medium level

Q1. DSA- oops questions were asked
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Q2. SQl queries were asked
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Q1. Authorisation and authentication difference
Ans. 
Authentication verifies the identity of a user, while authorization determines what actions they are allowed to perform.
• Authentication confirms the user's identity through credentials like passwords or biometrics.

• Authorization controls the access rights of authenticated users to specific resources or actions.

• Example: Logging into a system with a username and password is authentication, while being able to view/edit cer...read more
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