XpertLab Technologies Software Developer Interview Questions and Answers

25 MCQ questions online with time limit

Create webapp . Frontend, Backend , data encryption

Easy to medium
profit and loss questions
Permutation and combination

Easy to medium
45 mins

Q1. Basic concept of Oops Java basic
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Q2. Constructor Overloading
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Q3. Operator overloading in Java?
Ans. 
Operator overloading allows operators to be redefined for user-defined types in Java.
• Operator overloading is not supported in Java as it can lead to ambiguity and confusion.

• Java does not allow custom operators to be defined or existing operators to be overloaded.

• Instead of operator overloading, Java provides method overloading where methods with the same name but different parameters can be defined.
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Q4. Define java and it's features
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Java is a high-level, object-oriented programming language known for its platform independence and robust features.
• Java is platform-independent, meaning it can run on any device with a Java Virtual Machine (JVM)

• It is object-oriented, allowing for modular and reusable code

• Java is known for its robust standard library, which includes tools for networking, I/O, and more

• It supports multithreading, allowing for concurrent e...read more
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Q1. Introduction Present events
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Easy aptitude, 30 min with 20 question

Simple aptitude questions.

Q1. What's your strength ?
Ans. 
My strength lies in my problem-solving skills and ability to learn quickly.
• Strong problem-solving skills

• Quick learner

• Adaptability to new technologies

• Ability to work well under pressure
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Q2. Are you willing to work under pressure?
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Yes, I am comfortable working under pressure and have experience delivering high-quality work in tight deadlines.
• I have successfully completed projects with tight deadlines in my previous roles.

• I am able to prioritize tasks effectively and remain focused under pressure.

• I thrive in challenging situations and see them as opportunities to showcase my skills.

• I have experience working on urgent bug fixes and resolving issue
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It was easy process and the questions is easy for freshers to clear the interview

Q1. Oops c# mvc asp.net web api asp.net core
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Q1. What are oops concepts in java, explain real time scenario
Ans. 
OOPs concepts in Java include inheritance, polymorphism, encapsulation, and abstraction.
• Inheritance allows a subclass to inherit properties and methods from a superclass.

• Polymorphism allows objects to take on multiple forms and behave differently based on their context.

• Encapsulation hides the implementation details of an object and only exposes necessary information.

• Abstraction allows for the creation of abstract class...read more
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Q2. Uses of interface, inheritance
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Interfaces define contracts for behavior, while inheritance allows for code reuse and polymorphism.
• Interfaces allow for loose coupling and abstraction, enabling multiple implementations of the same behavior.

• Inheritance allows for code reuse and extension of existing classes, reducing code duplication.

• Polymorphism allows objects of different classes to be treated as if they were of the same class, simplifying code and i
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Q3. SQL query for join of tables
Ans. 
SQL query for joining tables
• Use JOIN keyword to combine two or more tables based on a related column

• Specify the columns to be selected using SELECT keyword

• Use ON keyword to specify the condition for joining the tables

• Different types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN
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Q4. Java concepts used in your project
Ans. 
Used Java concepts such as inheritance, polymorphism, and exception handling in my project.
• Implemented inheritance to create a base class and derived classes with specific functionalities.

• Utilized polymorphism to allow objects of different classes to be treated as if they were of the same class.

• Implemented exception handling to handle errors and prevent program crashes.

• Used interfaces to define a set of methods that a ...read more
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Q5. Overloading vs overriding, practical uses
Ans. 
Overloading is having multiple methods with the same name but different parameters. Overriding is having a method in a subclass with the same name and parameters as a method in the superclass.
• Overloading is used to provide different ways to call a method with different parameters

• Overriding is used to provide a specific implementation of a method in a subclass

• Overloading is resolved at compile-time while overriding is r...read more
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Q1. What is useState?
Ans. 
useState is a hook in React that allows functional components to have state.
• useState is a React hook used in functional components to manage state.

• It returns an array with the current state value and a function to update that value.

• Example: const [count, setCount] = useState(0);
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Q2. What's useEffect?
Ans. 
useEffect is a hook in React that allows performing side effects in function components.
• Used in React functional components to perform side effects

• Executes after render and after every update

• Can be used to fetch data, subscribe to events, update the DOM, etc.
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Q3. What is Redux and state management?
Ans. 
Redux is a predictable state container for JavaScript apps. It helps manage the state of an application in a centralized way.
• Redux is a state management library commonly used with React.

• It allows for a single source of truth for the state of an application.

• Actions are dispatched to update the state, and reducers specify how the state changes in response to actions.

• Redux DevTools can be used to track state changes and d...read more
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