ELV Projects Pvt Ltd Interview Questions and Answers

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.

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 frequency, while lists are used when the order and duplicates ma...read more

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() method.

• Example: String class implements Comparable inter...read more

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 across multiple classes.

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 smallest and largest elements.

• HashSet is implemented using a hash...read more

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