Utthunga Technologies Java Developer Interview Questions and Answers

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Q1. Asked basic to intermediate level questions Datatypes OOP concepts Code snippets
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Q1. 1. Basic OOP Concepts 2. Difference between structure and class in terms of constructor 3. Can members of structure be defined as private 4. What's lambda function and it's real life use case 5. Difference...read more
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Q2. 6. What's O(n) in time and space complexity
Ans. 
O(n) refers to linear time and space complexity.
• O(n) means that the time or space required by an algorithm grows linearly with the size of the input.

• It implies that the algorithm's performance is directly proportional to the input size.

• For example, if an algorithm takes 10 seconds to process 100 elements, it would take 20 seconds to process 200 elements.

• O(n) complexity is considered efficient and desirable in most case
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Q1. What is copy constructor?
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Copy constructor is a special type of constructor which creates a new object as a copy of an existing object.
• Copy constructor is used to initialize a new object as a copy of an existing object.

• It takes an object of the same class as a parameter.

• It is called automatically when a new object is created from an existing object.

• Example: class MyClass { public: MyClass(const MyClass& obj) { // copy constructor logic } };
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Q2. Difference between copy constructor and assignment operator
Ans. 
Copy constructor is used to create a new object as a copy of an existing object, while assignment operator is used to assign values from one object to another.
• Copy constructor is called when a new object is created from an existing object, while assignment operator is called when an existing object is assigned values from another object.

• Copy constructor creates a new object with its own memory space, while assignment o...read more
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Q3. What is static function
Ans. 
A static function is a function that is associated with a class rather than an instance of the class.
• Static functions can be called without creating an instance of the class.

• Static functions are commonly used for utility functions that do not require access to instance-specific data.

• Static functions are declared using the 'static' keyword in many programming languages.

• Example: 'Math.max()' in JavaScript is a static fun
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Q4. Write Fibonacci series
Ans. 
Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones.
• Start with 0 and 1 as the first two numbers in the series

• Add the previous two numbers to get the next number in the series

• Repeat this process to generate the Fibonacci series
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Q5. What is single ton design pattern
Ans. 
Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
• Ensures a class has only one instance

• Provides a global point of access to that instance

• Commonly used in scenarios where only one instance of a class is needed, such as database connections or logging
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Q1. What is the concept of virtual inheritance in relation to vtables and vptrs in object-oriented programming?
Ans. 
Virtual inheritance allows a derived class to inherit from a base class without creating duplicate base class subobjects.
• Virtual inheritance is used to resolve the Diamond Problem in C++ where a class inherits from two classes that have a common base class.

• It ensures that only one copy of the base class is inherited by the derived class.

• Virtual inheritance introduces a virtual base class subobject to the derived class,...read more
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Q2. Explained about vtptr and vtable initialisation and structure
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Q1. What is the implementation of a class for string operations?
Ans. 
A class for string operations can include methods for concatenation, substring extraction, length calculation, etc.
• Create a class with methods like concatenateStrings, extractSubstring, calculateLength, etc.

• Use string manipulation functions like substring, concat, length, etc. within the class methods.

• Ensure error handling for edge cases like empty strings or out-of-bounds indices.

• Example: class StringOperations { conc...read more
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Q1. Why do you want to join this company?
Ans. 
I admire your company's innovative approach and commitment to quality, which aligns with my career goals and values as a developer.
• Your company's focus on cutting-edge technology, like AI and machine learning, excites me as I want to work on impactful projects.

• I appreciate your commitment to professional development, such as mentorship programs, which will help me grow my skills.

• The collaborative culture here fosters c...read more
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Q2. What are the sql constraints?
Ans. 
SQL constraints are rules applied to table columns to enforce data integrity and validity.
• PRIMARY KEY: Uniquely identifies each record in a table. Example: `CREATE TABLE Users (UserID INT PRIMARY KEY);`

• FOREIGN KEY: Ensures referential integrity between two tables. Example: `FOREIGN KEY (UserID) REFERENCES Users(UserID)`.

• UNIQUE: Ensures all values in a column are different. Example: `CREATE TABLE Users (Email VARCHAR(25...read more
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The aptitude test is beneficial and somewhat easy.

The coding test was both successful and somewhat challenging.

Group discussions are highly beneficial.

Q1. What is the concept of Object-Oriented Programming (OOP) in Python?
Ans. 
Object-Oriented Programming (OOP) in Python is a programming paradigm based on objects and classes to structure code effectively.
• Encapsulation: Bundling data and methods that operate on the data within one unit (class). Example: class Dog with attributes and methods.

• Inheritance: Mechanism to create a new class using properties of an existing class. Example: class Bulldog inherits from class Dog.

• Polymorphism: Ability to...read more
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Q2. What can you tell me about machine learning algorithms?
Ans. 
Machine learning algorithms enable computers to learn from data and make predictions or decisions without explicit programming.
• Supervised Learning: Algorithms learn from labeled data. Example: Linear Regression for predicting house prices.

• Unsupervised Learning: Algorithms identify patterns in unlabeled data. Example: K-Means Clustering for customer segmentation.

• Reinforcement Learning: Algorithms learn by interacting wi...read more
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Q1. Can you tell me about yourself?
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Q2. What makes you a suitable candidate for this position?
Ans. 
I possess a blend of relevant skills, experience, and a strong commitment to contributing positively to your team.
• Strong analytical skills: In my previous role, I successfully analyzed market trends to improve product positioning.

• Team collaboration: I led a project team that increased efficiency by 20% through effective communication and delegation.

• Adaptability: I quickly learned new software tools that enhanced our wo...read more
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Q1. Your identified development ar Expectations from New role and organisations
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