Valuefy Solutions Backend Developer Interview Questions and Answers

Q1. Questions on IOT and related
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Questions mainly from Linked list.

Q1. Basically coding round, with basic questions from arrays. One needs to have good communication skills to explain to interviewers.
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Basic java questions

Q1. Explain Linked list implementation and stack
Ans. 
Linked list is a data structure where each element points to the next element. Stack is a data structure that follows Last In First Out (LIFO) principle.
• Linked list implementation involves creating nodes with data and a pointer to the next node.

• Stack implementation involves pushing elements onto the stack and popping them off in reverse order.

• Example: Linked list - 1 -> 2 -> 3 -> NULL, Stack - push(1), push(2), push(3)
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Q2. Oops concepts in java
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Oops concepts in Java refer to Object-Oriented Programming principles like Inheritance, Encapsulation, Polymorphism, and Abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability of a method to do different things based on the object it is acting upon.

• Abstraction: Hiding the imp...read more
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Q1. 3 dsa problem asked
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Covers basics aps around 15 question

DSA based questions from leetcode easy and medium

Q1. Tell me about yourself
Ans. 
I am a data analyst with a strong background in statistics and data visualization.
• Graduated with a degree in Statistics

• Proficient in programming languages like Python and R

• Experience in analyzing large datasets and creating data visualizations

• Strong problem-solving skills
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Q1. What is JPA
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JPA (Java Persistence API) is a specification for managing relational data in Java applications using object-relational mapping.
• JPA provides a way to map Java objects to database tables.

• It simplifies database interactions through an object-oriented approach.

• Common implementations include Hibernate, EclipseLink, and OpenJPA.

• Example: Using JPA annotations like @Entity to define a persistent class.

• JPA supports querying wi...read more
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Q2. Write a program to find duplicate elements in the list
Ans. 
This program identifies and returns duplicate elements from a given list.
• Use a set to track seen elements and a list for duplicates.

• Iterate through the list and check if an element is in the set.

• If it is, add it to the duplicates list; otherwise, add it to the set.

• Example: For the list [1, 2, 3, 2, 4, 3], the output should be [2, 3].
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