Quadgen Wireless Solutions Software Developer Interview Questions and Answers

Mcq based on language

Q1. Do you know STL. Find loop in linked list.
Ans. 
STL knowledge and finding loop in linked list
• STL (Standard Template Library) is a C++ library that provides containers, algorithms, and iterators.

• To find a loop in a linked list, we can use Floyd's cycle-finding algorithm.

• In this algorithm, we use two pointers, one moving at a slower pace and the other at a faster pace.

• If there is a loop in the linked list, the faster pointer will eventually catch up to the slower poin...read more
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There were 3 sections. 1st was aptitute 10 questions and 2nd section was technical 10 questions then 3rd section had 3 coding questions which were of easy level.

Q1. Questions related to OS and CN and Core java were asked.
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Q2. A coding question was also asked to to find the second largest number.
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Level of difficult is medium

Focused more on arrays

Q1. Find a duplicate in a String OOPs concept Java 8 features
Ans. 
The question is about finding a duplicate in a string.
• Convert the string into an array of characters

• Create a HashSet to store unique characters

• Iterate through the array and check if each character is already present in the HashSet

• If a character is already present, it is a duplicate
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Q1. Java OOPs concept Comparator vs Comparable Streams Lambda Expression
Ans. 
Comparator vs Comparable, Streams, Lambda Expression
• Comparator and Comparable are interfaces used for sorting objects in Java

• Comparator is used for custom sorting logic, while Comparable is used for natural sorting order

• Streams are a sequence of elements that can be processed in parallel or sequentially

• Lambda expressions are used to write concise and functional code in Java
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Q1. System Desing of Network Management System
Ans. 
A network management system is designed to monitor and control network devices and ensure their efficient operation.
• The system should have a centralized dashboard to display real-time network status and performance metrics.

• It should support automated network discovery and device configuration management.

• The system should provide alerts and notifications for network events and failures.

• It should have the ability to gene...read more
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Q1. Background why Tejas Salary Discussion
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Q1. Abstract class java
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Q2. Inheritance in java
Ans. 
Inheritance in Java allows a class to inherit properties and behaviors from another class.
• Inheritance is achieved using the 'extends' keyword in Java.

• Subclasses can access the methods and fields of their superclass.

• Java does not support multiple inheritance, but a class can implement multiple interfaces.
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Q3. SQL query to find last element
Ans. 
Use SQL query with ORDER BY and LIMIT to find the last element in a table.
• Use ORDER BY column_name DESC to sort the data in descending order.

• Use LIMIT 1 to retrieve only the last element.
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Q4. Html 5 vs Html
Ans. 
HTML5 is the latest version of HTML with new features and improvements.
• HTML5 supports new elements like <video>, <audio>, and <canvas> for multimedia content.

• HTML5 introduces new APIs like Geolocation, Web Storage, and Web Workers for enhanced functionality.

• HTML5 includes improvements in semantics, accessibility, and performance compared to HTML.
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Q5. About the company
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Q1. Find the min and max from List of Integers using java 8 streams.
Ans. 
Find min and max from List of Integers using Java 8 streams.
• Use the `stream()` method on the List to create a stream of integers.

• Use the `min()` method to find the minimum value.

• Use the `max()` method to find the maximum value.
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Q2. Find 2nd largest element using java 8 streams from list of integers.
Ans. 
Find 2nd largest element using Java 8 streams from a list of integers.
• Sort the list of integers in descending order using streams.

• Skip the first element to get the second largest element.
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Q3. Given a Product class and some ArrayList data Find which products has price greater than 200 using java 8 streams?. Find which products having maximum price?
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Q4. Increase a value of List of Integers by *2 and written new list.
Ans. 
Increase the values of a list of integers by 2 and create a new list.
• Iterate through the list of integers

• For each integer, add 2 to its value

• Create a new list with the updated values
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Q5. What are the java new features?
Ans. 
Java has introduced several new features in recent versions.
• Java 8 introduced lambda expressions, which allow for functional programming.

• Java 8 also introduced the Stream API for processing collections of data.

• Java 9 introduced the module system, which provides better encapsulation and modularity.

• Java 10 introduced local variable type inference, allowing the omission of explicit type declarations.

• Java 11 introduced the...read more
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Q6. @Components vs @Repository
Ans. 
The @Component and @Repository annotations are used in Spring Framework for different purposes.
• Both annotations are used to define beans in the Spring container.

• @Component is a generic stereotype annotation for any Spring-managed component.

• @Repository is a specialization of @Component used for DAO classes.

• The @Repository annotation provides additional exception translation for data access exceptions.

• Using @Repository i...read more
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Q7. @SpringBootApplication
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Q8. @Entity explain?
Ans. 
The @Entity annotation is used in Java to mark a class as an entity, which represents a table in a relational database.
• The @Entity annotation is part of the Java Persistence API (JPA) and is used in object-relational mapping (ORM) to map Java objects to database tables.

• It is typically used in conjunction with other JPA annotations like @Table, @Column, and @Id.

• The @Entity annotation is used to define the entity name, s...read more
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Q9. How the database is configure?
Ans. 
The database is configured by setting up the necessary parameters and configurations to ensure proper functioning and performance.
• Database configuration involves defining the database schema, tables, and relationships.

• It includes setting up indexes and constraints for data integrity.

• Configuring database security measures like user access control and permissions.

• Tuning database performance by optimizing query execution ...read more
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Q10. What is Dockerfile?
Ans. 
Dockerfile is a text file that contains instructions to build a Docker image.
• Dockerfile is used to automate the creation of Docker images.

• It specifies the base image, dependencies, environment variables, and commands to run.

• Each instruction in the Dockerfile creates a new layer in the image.

• Dockerfile can be version controlled and shared to ensure consistent builds.

• Example: FROM ubuntu:latest RUN apt-get update && apt-...read more
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Q11. Explain CI CD and your project deployment.
Ans. 
CI/CD is a software development practice that enables frequent and automated code integration, testing, and deployment.
• CI/CD stands for Continuous Integration and Continuous Deployment.

• It involves automating the process of integrating code changes, running tests, and deploying the application.

• CI/CD helps in reducing manual errors, improving code quality, and increasing development speed.

• Tools like Jenkins, GitLab CI/CD...read more
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Q12. What is mutable classes in java? How to create?
Ans. 
Mutable classes in Java are classes whose state can be modified after creation.
• Mutable classes allow changing their internal state

• They can have mutable fields or methods that modify their state

• To create a mutable class, define fields with non-final modifiers

• Provide public methods to modify the state of the class
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Q1. Yet to sChedule
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