Firstsource Solutions Senior Java Developer Interview Questions and Answers

Q1. What is Rabbit MQ?
Ans. 
RabbitMQ is a message broker software that implements the Advanced Message Queuing Protocol (AMQP).
• RabbitMQ allows different software systems to communicate by sending and receiving messages.

• It can be used to decouple different parts of a system, making it more scalable and resilient.

• RabbitMQ supports multiple messaging protocols, including AMQP, MQTT, and STOMP.
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Q2. What is LINQ in .net?
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LINQ (Language Integrated Query) is a feature in .NET that allows querying data from different data sources using a uniform syntax.
• LINQ allows querying data from collections, databases, XML, and more.

• It provides a set of standard query operators like Where, Select, OrderBy, etc.

• LINQ queries are written in C# or VB.NET and are type-safe.

• Example: var result = from num in numbers where num % 2 == 0 select num;
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Q1. Hash map implementation
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Hash map is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.
• Hash map uses a hash function to map keys to indices in an array.

• Collision handling is important in hash map implementation.

• Common operations include adding, removing, and retrieving key-value pairs.

• Example: HashMap map = new HashMap<>();
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Q2. About software development models
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A person ability in a particular skills or field of knowledge

Q1. Tell me about your self ?
Ans. 
I am a passionate Java Developer with 5 years of experience in developing web applications and strong knowledge of Java technologies.
• 5 years of experience in Java development

• Proficient in developing web applications

• Strong knowledge of Java technologies
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Q2. What are strength ?
Ans. 
Strengths are qualities or attributes that make an individual or team effective in achieving goals.
• Physical strength: Ability to lift heavy objects or perform physically demanding tasks.

• Emotional strength: Resilience in facing challenges and managing stress.

• Intellectual strength: Problem-solving skills and critical thinking abilities.

• Interpersonal strength: Effective communication and teamwork skills.

• Adaptability: Abil...read more
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Q3. Why are interested in this job?
Ans. 
I am passionate about Java development and excited about the opportunity to work on challenging projects.
• I have a strong background in Java programming and enjoy solving complex problems.

• I am eager to contribute my skills and expertise to a dynamic team.

• I am interested in this job because it offers the chance to work on cutting-edge technologies and make a real impact.
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Q4. Tell me about your studying
Ans. 
I have a Bachelor's degree in Computer Science and have taken various online courses to further my knowledge in Java development.
• Bachelor's degree in Computer Science

• Online courses in Java development

• Continuous learning and staying updated with latest technologies
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Q1. Tell me about your self
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Q2. Tell me about latest project
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10 day,Numbers,Alebra

Q1. Oop,C++.html,css,javascrept
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Q2. What is order list
Ans. 
An ordered collection of items, typically displayed in a numbered list.
• Order list is used to display items in a specific sequence.

• Items in an order list are typically numbered or marked with bullets.

• Example:

  1. Item 1
  2. Item 2
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Q3. What is javascript
Ans. 
JavaScript is a high-level, interpreted programming language used for creating interactive websites.
• JavaScript is commonly used for client-side web development.

• It can be used to add interactivity to websites, such as form validation or dynamic content.

• JavaScript can also be used for server-side development with Node.js.

• Examples of JavaScript frameworks/libraries include React, Angular, and Vue.
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Q4. What is ===operator
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=== operator is a strict equality operator in JavaScript that checks if two values are equal in both value and type.
• === operator returns true if both operands are of the same type and have the same value

• It does not perform type coercion, unlike the == operator

• Example: 5 === '5' will return false because the operands are of different types
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Q5. What is the main features of oop
Ans. 
Main features of OOP include encapsulation, inheritance, and polymorphism.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability to create new classes based on existing classes, inheriting their attributes and methods.

• Polymorphism: Ability for objects of different classes to respond to the same message in different ways.

• Example: Encapsulation - a class 'Car' wi...read more
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Q1. Write a query for inner join
Ans. 
An inner join query combines rows from two or more tables based on a related column between them.
• Use the SELECT statement to specify the columns you want to retrieve

• Use the FROM clause to specify the tables you want to join

• Use the INNER JOIN keyword to perform an inner join based on a common column
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Cat level maths are to be solved

Java coding basic questions