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QuadB Blockchain Developer Interview Questions and Answers
QuadB Blockchain Developer Interview Experiences
1 interview found
Anonymous
Selected
I applied via LinkedIn and was interviewed in Jun 2024. There were 2 interview rounds.
Based on Solidity and ICP.
(2 Questions)
- Q1. Based on solidity
- Q2. Coding question( hard level)
Top trending discussions
Interview questions from similar companies
(2 Questions)
- Q1. Basics Of blockchain
- Q2. Previous project roles and responsibilities
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Salesforce Developer Interview Questions & Answers
HDFC Bank
Chinmay Dharwadkar
posted on 5 Nov 2024
I applied via Naukri.com
(2 Questions)
- Q1. R u interested in sales
- Ans.
Yes, I am interested in sales as it allows me to understand customer needs and provide solutions.
I enjoy interacting with customers and understanding their requirements.
I am motivated by meeting sales targets and achieving success.
I believe in the value of building relationships with clients to drive business growth.
- Q2. Ready to relocation
- Ans.
Yes, I am ready for relocation.
I am open to relocating for the right opportunity
I have experience moving for previous jobs
I am excited about the possibility of living in a new city
They discussed some easy questions on Node JS and Dp and heap , binary search
(2 Questions)
- Q1. Introduce yourself
- Q2. What is multithreading and explain its usecases.
- Ans.
Multithreading is the ability of a CPU to execute multiple threads concurrently, improving performance and responsiveness.
Multithreading allows for parallel execution of tasks, improving performance by utilizing multiple CPU cores.
It is commonly used in applications that require handling multiple tasks simultaneously, such as web servers, video games, and data processing.
Multithreading can help improve responsiveness i...
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Skills evaluated in this interview
Selected
I applied via Job Fair and was interviewed in Jun 2023. There were 3 interview rounds.
Ms office,Core Java , Tally , C,
In my Opinion,view , If you ask me, As far as I can see/I am Concerned , It seems to me that , I think /feel/reckon/ belive , If you want my option , What we have to decide
Interview Preparation Tips
I applied via Approached by Company and was interviewed in Jun 2022. There were 3 interview rounds.
(1 Question)
- Q1. Java 8 oops spring spring boot rest api
(1 Question)
- Q1. Java 8 spring stream api java oops rest api
(1 Question)
- Q1. It was salary negotiation round which went good with a FAKE promise that the offer will be rolled out the next day which was also the last working day , they didnt roll the offer out with a lame excuse .
Interview Preparation Tips
I applied via campus placement at CDAC, Noida and was interviewed in Jan 2022. There were 4 interview rounds.
Best way to prefer java, core java and most imp spring boot because many of companies required spring boot now a days
(7 Questions)
- Q1. What is java is the basic question for everyone
- Q2. What is difference between path and classpath variables
- Ans.
Path variable is used to locate executable files while classpath variable is used to locate Java classes.
Path variable is used by the operating system to locate executable files.
Classpath variable is used by Java to locate classes and resources.
Path variable is system-specific while classpath variable is Java-specific.
Path variable is set by the user while classpath variable is set by the developer.
Example of path vari...
- Q3. What is enum in java
- Ans.
Enum is a special data type in Java used to define a set of constants.
Enums are used to represent a fixed number of values that do not change.
They are declared using the enum keyword.
Each enum constant is an object of the enum type.
Enums can have constructors, methods, and fields.
Example: enum Color { RED, GREEN, BLUE }
Enums can also have values associated with them, like Color.RED(255, 0, 0).
- Q4. What is 2 phase commit
- Ans.
2 phase commit is a protocol used to ensure distributed transactions are either committed or rolled back.
Used in distributed systems where multiple databases are involved in a transaction
Ensures all databases either commit or rollback the transaction
Involves a coordinator and multiple participants
Coordinator sends a prepare message to participants, who respond with either commit or abort
If all participants respond with...
- Q5. They can ask questions on your project
- Q6. Is java completely object oriented?
- Ans.
Yes, Java is completely object oriented.
Java is designed to be completely object oriented.
All code in Java is written inside classes and objects.
Java supports encapsulation, inheritance, and polymorphism.
Java does have some non-object oriented features like primitive data types.
However, even these can be treated as objects using wrapper classes.
- Q7. What is exception in java?
- Ans.
Exception is an event that occurs during the execution of a program and disrupts the normal flow of instructions.
Exceptions are objects that are thrown at runtime when an abnormal condition occurs
Java provides a set of predefined exceptions that can be used to handle errors
Exceptions can be caught and handled using try-catch blocks
Unchecked exceptions are those that are not checked at compile-time, while checked except
(1 Question)
- Q1. No specific questions they can ask about company only and will talk about package
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Skills evaluated in this interview
Rekha D
I applied via Walk-in
General knowledge ,appitude
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Interview Questionnaire
2 Questions
- Q1. What is dependency injection
- Ans.
Dependency injection is a design pattern that allows objects to receive dependencies rather than creating them.
It helps to decouple the code and makes it more testable and maintainable.
It allows for easier swapping of dependencies without changing the code.
There are three types of dependency injection: constructor injection, setter injection, and interface injection.
Example: Instead of creating a database connection ob...
- Q2. What is the use of bean factory
- Ans.
Bean factory is used for creating and managing instances of beans in Spring framework.
Bean factory is responsible for creating and managing instances of beans defined in the Spring configuration file.
It provides a way to decouple the configuration and specification of dependencies from the actual application code.
Bean factory supports different scopes of beans such as singleton, prototype, request, session, etc.
It also...
Interview Preparation Tips
Skills evaluated in this interview
I applied via Company Website and was interviewed in Dec 2020. There were 3 interview rounds.
Interview Questionnaire
12 Questions
- Q1. What is System.out.println?
- Ans.
System.out.println is a Java statement used to print output to the console.
System is a class in Java's core library.
out is a static member of the System class.
println is a method of the PrintStream class.
It is used to print output to the console.
It adds a newline character at the end of the output.
- Q2. What is static or final method?
- Ans.
Static or final method is a method that belongs to a class rather than an instance of the class.
Static method can be called without creating an instance of the class.
Final method cannot be overridden by a subclass.
Static and final methods can be accessed using the class name.
Example: Math.max() is a static method in the Math class.
Example: String.toUpperCase() is a final method in the String class.
- Q3. What is collection?
- Ans.
A collection is a group of objects that can be stored, manipulated, and retrieved as a single unit.
Collections are used to store and manage groups of related objects.
Java provides several built-in collection classes such as ArrayList, LinkedList, HashSet, etc.
Collections can be used to perform operations like sorting, searching, filtering, and more.
Collections can be generic or non-generic, depending on the type of obj
- Q4. Add string or integer value using map?
- Ans.
Yes, we can add string or integer value using map in Java.
We can use put() method to add values to a map.
For string values, we can use String as the value type.
For integer values, we can use Integer as the value type.
Example: Map
Example: Map
- Q5. What is difference between sleep or wait method?
- Ans.
Sleep method pauses the thread for a specified time, while wait method pauses the thread until notified.
Sleep method is a static method of Thread class, while wait method is an instance method of Object class.
Sleep method does not release the lock on the object, while wait method releases the lock and waits for notification.
Sleep method can be interrupted by another thread, while wait method can only be interrupted by ...
- Q6. What is join in sql?
- Ans.
Join in SQL is used to combine rows from two or more tables based on a related column between them.
Join is used to retrieve data from multiple tables in a single query
Types of join include inner join, left join, right join, and full outer join
Join condition is specified using ON keyword
Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column
Join can also be used with subqueries
- Q7. SQL queries?
- Ans.
SQL queries are used to retrieve, manipulate and manage data stored in relational databases.
SQL stands for Structured Query Language
Queries can be used to retrieve specific data from tables
Queries can also be used to update, insert or delete data
Examples of SQL queries include SELECT, INSERT, UPDATE and DELETE
Understanding SQL is important for working with databases in Java
- Q8. Http or generic?
- Q9. Spring MVC flow?
- Q10. Abstraction vs interface?
- Ans.
Abstraction is a concept of hiding implementation details while interface is a contract that defines the behavior of a class.
Abstraction is achieved through abstract classes and methods
Interface is a collection of abstract methods and constants
Abstraction allows for flexibility in implementation
Interface allows for multiple inheritance
Abstraction is used for code reusability
Interface is used for achieving polymorphism
- Q11. Overloading vs overriding?
- Ans.
Overloading is when multiple methods have the same name but different parameters. Overriding is when a subclass provides a different implementation of a method inherited from its superclass.
Overloading is resolved at compile-time based on the method signature.
Overriding is resolved at runtime based on the actual object type.
Overloading is used to provide different ways to call a method with different parameters.
Overrid...
- Q12. Encapsulation?
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