TechAffinity Interview Questions and Answers

Q1. What is the difference between a set and a list?
Ans. 
A set is an unordered collection of unique elements, while a list is an ordered collection of elements that may contain duplicates.
• Sets do not allow duplicate elements, while lists can have duplicate elements.

• Sets are unordered, meaning the elements do not have a specific order, while lists maintain the order of elements.

• Sets are typically used when the existence of an element is more important than the order or freque...read more
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Q2. What is the purpose of an interceptor?
Ans. 
An interceptor is a software design pattern that allows for pre-processing and post-processing of requests and responses.
• Interceptors can be used for logging, authentication, authorization, caching, error handling, and more

• They can intercept HTTP requests and responses in web applications

• Examples include Angular HTTP interceptors, Spring Interceptors in Java, and Axios interceptors in JavaScript
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Q3. What is Spring Security?
Ans. 
Spring Security is a powerful and customizable authentication and access control framework for Java applications.
• Provides comprehensive security services for Java EE-based enterprise software applications

• Supports authentication, authorization, and protection against common security vulnerabilities

• Integrates with Spring Framework for seamless security configuration

• Allows for easy customization and extension through conf...read more
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Q4. Can you explain the workflow of your project?
Ans. 
The workflow of the project involves planning, development, testing, and deployment.
• Planning phase includes gathering requirements and creating a project plan.

• Development phase involves writing code and implementing features.

• Testing phase includes unit testing, integration testing, and user acceptance testing.

• Deployment phase involves releasing the software to production environment.

• Iterative process with feedback loop
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Q5. What is a program to sort a list in descending order?
Ans. 
Use a sorting algorithm like quicksort or mergesort to sort the list in descending order.
• Implement a sorting algorithm like quicksort or mergesort to sort the list in descending order.

• Modify the comparison function to sort the elements in descending order.

• Ensure the sorting algorithm is efficient and handles edge cases like duplicate elements.
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Q6. Which one is better, Comparator or Comparable?
Ans. 
Comparable is better for natural ordering, while Comparator is better for custom ordering.
• Comparable is used to define the natural ordering of objects, while Comparator is used to define custom ordering.

• Comparable is implemented by the class whose objects need to be compared, while Comparator is implemented by a separate class.

• Comparable uses the compareTo() method to compare objects, while Comparator uses the compare(...read more
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Q7. What is Spring AOP (Aspect-Oriented Programming)?
Ans. 
Spring AOP is a programming paradigm that allows separating cross-cutting concerns from the main application logic.
• Spring AOP enables modularization of concerns such as transaction management, logging, security, etc.

• It allows defining aspects (cross-cutting concerns) and applying them to multiple classes.

• AspectJ is a popular implementation of AOP in Spring framework.

• Example: Using AOP to log method execution time acros
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Q8. What are the uses of HashSet and TreeSet in Java?
Ans. 
HashSet is an unordered collection of unique elements, while TreeSet is a sorted set implemented using a tree structure.
• HashSet does not maintain any order of elements, while TreeSet maintains elements in sorted order.

• HashSet allows null values and is generally faster for adding, removing, and checking for existence of elements.

• TreeSet does not allow null values and provides efficient operations for finding the smalles...read more
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Q1. What is react, how it's working
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HTML, CSS, javascript, boostsrap

Q1. Personal Information
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Q1. Javascript POST, GET, PUT request
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