QBurst Technologies Interview Questions, Process, and Tips

Q1. Spring modules - spring aop, spring security
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Q2. Given a string, get the count of each word in the string and put it in map
Ans. 
Count the occurrence of each word in a given string and store it in a map.
• Split the string into words using whitespace as delimiter

• Create a map to store the word count

• Iterate through the words and update the count in the map

• Return the map
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Q3. Questions on SQL native queries
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Q4. Class not found and no class definition found exception
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Class not found and no class definition found exception occurs when a required class is not found during runtime.
• This exception occurs when the JVM tries to load a class but cannot find it in the classpath.

• It can happen if the class is missing from the project dependencies or if the classpath is not properly configured.

• Check if the class is present in the correct package and if it is included in the project dependencie...read more
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Q5. Annotations in spring boot used
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Annotations are used in Spring Boot for various purposes such as mapping requests, defining beans, and handling exceptions.
• Annotations are used to provide metadata to the Spring framework.

• They are used to map requests to controller methods using @RequestMapping.

• Annotations like @Component, @Service, and @Repository are used to define beans.

• Annotations like @ExceptionHandler and @ControllerAdvice are used for handling e...read more
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Q6. Http port & tomcat port
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Q7. What is Singleton class
Ans. 
Singleton class is a class that allows only one instance of itself to be created and provides a global point of access to it.
• Singleton class restricts the instantiation of a class to a single object.

• It is used when only one instance of a class is required to control actions throughout the system.

• The Singleton pattern is implemented by creating a class with a method that creates a new instance of the class if one doesn'...read more
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Q8. What are the features in java 8
Ans. 
Java 8 introduced several new features including lambda expressions, streams, and default methods.
• Lambda expressions for functional programming

• Streams for efficient processing of large data sets

• Default methods to add new functionality to interfaces

• Date and Time API for improved handling of date and time

• Nashorn JavaScript engine for improved performance

• Parallel array sorting for faster sorting of large arrays
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Q9. What is functional interface
Ans. 
Functional interface is an interface with only one abstract method.
• Functional interface can have any number of default or static methods

• It is used for lambda expressions and method references

• Examples include Runnable, Comparator, and Function interfaces
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Q10. Difference between jvm jre and jdk
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JVM is an environment to run Java programs, JRE is a runtime environment, and JDK is a development kit.
• JVM stands for Java Virtual Machine and is responsible for executing Java bytecode.

• JRE stands for Java Runtime Environment and provides a runtime environment for Java programs.

• JDK stands for Java Development Kit and includes tools for developing Java applications.

• JDK includes JRE and additional development tools such ...read more
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Q11. What are Design patterns
Ans. 
Design patterns are reusable solutions to common software development problems.
• Design patterns provide a common language for developers to communicate about solutions to common problems.

• They can improve the quality, maintainability, and scalability of software.

• Examples include the Singleton pattern, Factory pattern, and Observer pattern.

• Design patterns can be categorized into three groups: creational, structural, and b
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Q1. Explain singleton design pattern.
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Q2. Streaming query to get frequently occurring character.
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Q3. SQL query for outer join scenario
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Q1. Questions related to Jwt token
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Q2. Questions related to current project architecture
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3 questions
1. Check the given string is reversed?
input: "worldhello" output: "true"
2. Check the given string is permutation of palindrome?
3. Sort a stack using an empty stack

Q1. Javascript basics
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Q2. Nodejs basics questions
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Q1. How do GO handle concurrency?
Ans. 
GO uses goroutines and channels to handle concurrency efficiently.
• GO uses goroutines to achieve concurrency. Goroutines are lightweight threads managed by the Go runtime.

• Channels are used to communicate between goroutines. They provide a safe way to pass data between concurrent processes.

• GO also has a built-in 'sync' package for synchronization primitives like mutexes and wait groups.

• GO's 'select' statement allows for ...read more
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Q2. What is defer in GO ? If there are multiple defers in a function, what will be order of execution of these?
Ans. 
defer in Go is used to delay the execution of a function until the surrounding function returns.
• Defer is used to ensure that a function call is performed at the end of the surrounding function, regardless of where the defer statement is located.

• If there are multiple defers in a function, they will be executed in Last In, First Out (LIFO) order.

• Example: func exampleFunc() { defer fmt.Println('First defer'); defer fmt.Pr...read more
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